OpenFront Boat vs Ground Attack: Choosing the Right Tool Across Water

Direct answer: ground spreads force across the border; boats concentrate it on one beach

When the enemy is across water, you have two fundamentally different tools and the right one depends on what you actually want to do to them. A ground attack pulls 20% of your total troop pool (the game computes troops / 5) and pushes that force out through every border tile you share with the enemy at once — the attack spreads along your whole common coastline and the enemy gets to choose which of those fronts to contest. A boat strike pulls the same 20% per boat (up to three boats in one operation, so up to 60% total) but concentrates it on a single landing tile you pick, drops it directly onto the enemy’s shore, and that landing is taken by conquest rather than contested on the ground. The boat’s landing is effectively guaranteed against a one-tile shore: it cannot be out-trooped on the beach, and the only ways to stop it are a warship shell that sinks the boat in the water or a nuke that erases the landing site.

So the one-line answer is: use a boat when you want to strike a specific, chosen part of the enemy across water without paying for the rest of the border; use a ground attack when the enemy borders you on land and you want to apply pressure along the whole shared front at once. The boat is a precision instrument — it lets you hit one island while deliberately leaving another front untouched, which is impossible with a ground attack, because a ground attack always spreads across every shared border you have with that player. The ground attack is a sledgehammer — it is the natural choice whenever the two of you share a land border, because it costs no extra transit, cannot be sunk mid-transit, and the enemy cannot reroute their defense to a different front the way they can against a boat. Everything below is about reading which of those two shapes fits the situation, the exact numbers behind each, and the two concrete scenarios where the choice flips.

If your question is narrower than this page, the adjacent guides handle it: the cross-water commitment guide covers how much of your army to commit across the sea in one operation, the transport landings guide covers choosing a beach, screening the route, and holding it, and the micro boat spam guide covers the repeated small-send harassment variant. This page sits one level up: it is the decision of which tool to reach for before you start sizing the commitment.

The mechanical difference: distribution vs concentration

The single fact that drives every other point on this page is where the troops go. A ground attack in OpenFront is not aimed at a specific enemy tile. When you attack a player you border on land, the engine computes the attack amount (20% of your pool) and then distributes that force across every border tile between you and the target — the attack object accumulates neighboring enemy tiles from all of your border tiles simultaneously, and each contested tile gets a share of the troops proportional to the situation there. You do not pick a beach for a ground attack; the border picks it for you, and it picks all of them.

A boat strike is the opposite. When you launch a boat, you designate one destination shore, the game spawns up to three transport ships from your port, and each one carries 20% of your pool (the engine computes floor(troops/5) per boat). The landing happens at the tile the pathfinder resolves on that shore, and that tile is conquered directly — the engine runs a conquer on the destination rather than an attack fight, so there is no ground-level contest on the beach itself. The concentration is the point: a boat delivers its full load to one place the enemy may not have defended, instead of spreading it thinly across a whole coastline they have fortified.

This difference has a direct tactical consequence. Because a ground attack spreads across all shared borders, the enemy can rotate their defense to whatever front you are actually pushing on, since they see the attack coming along a front they control and can commit troops to the contested tiles. A boat, by contrast, lands on a shore the enemy may have left open precisely because they did not expect a naval strike there — the boat’s target is a choice you make, not a front the enemy can pre-position against. That asymmetry is why boats feel so much stronger in small doses: you are not matching the enemy’s entire defense, you are inserting a chunk of your army at a point of your choosing and letting it land before the enemy can rotate.

There is a cost to the concentration, though: a boat can only go where water goes. If the enemy’s mainland is landlocked, or your own shore is enclosed, the boat simply has no route, and a ground attack across the shared land border is the only option. The boat is a tool for the situations where water is the medium; the ground attack is the tool for the situations where land is the medium, and the moment you share a land border with a target, the ground attack becomes available and usually cheaper.

The cost model: what each tool actually spends

Both tools spend the same base currency — 20% of your troop pool — but the shape of the spend and the timing differ, and the timing is where most players lose troops they did not know they were spending.

A ground attack deducts its 20% from your pool the instant you click the enemy on land, and the troops are committed immediately; there is no transit, so there is no window in which the committed troops are out of your control. A boat strike, by contrast, deducts its load from your pool at launch, and then the committed troops are in transit across open water for the entire crossing. During that crossing the troops are in limbo: not available to defend your own coast, not yet able to fight, and exposed to a warship shell (which destroys the boat and the full load) or to the landing site being nuked to water (which triggers an automatic retreat, costing 25% of the load). The crossing time is set by the boat speed — one tile per tick at 100ms per tick — so a short strait crossing is a matter of seconds while a long open-ocean lane can be minutes, and every second of that window is a second your home coast is thinner and the enemy can screen the lane.

Tool	Force per action	Where it goes	When troops are deducted	Transit risk	Enemy can pre-position?
Ground attack	20% of pool	Spread across all shared border tiles	Instant	None (no transit)	Yes, along the whole front
Boat strike	20% per boat, max 3 boats (60% total)	One chosen landing tile	At launch (then in transit)	Warship shell / nuke on landing	No, on a beach they did not choose

The table makes the decision concrete: the boat spends the same 20% but buys choice of landing and surprise, at the cost of transit risk and your own thinning during the crossing. The ground attack spends the same 20% but buys immediacy and no transit risk, at the cost of no choice of front and being fully readable by the enemy. When you are choosing between them, you are not choosing between “more troops” and “fewer troops” — you are choosing between concentration with transit risk and distribution with none, and the right answer depends on whether the enemy’s defense is concentrated or spread, and whether you can afford the crossing window.

One more timing detail is worth spelling out because it is where the real cost hides. A ground attack’s 20% is committed for only a moment: the moment the front breaks, those troops are fighting on the new tile and the moment after they are garrison there, so your pool returns to full strength almost as soon as the attack is launched. A boat’s 20% is committed for the entire crossing: the deduction happens at launch, the troops are gone from your pool for the whole transit, and only when the boat lands do they re-enter play. That means a single boat crossing of a short strait costs you roughly the same effective troop time as one ground attack, but a boat crossing of a long open-ocean lane can leave your pool at 80% for several in-game minutes, during which every enemy you border can probe your coast and you cannot answer. So the honest way to compare the two is not “both cost 20%” but “the ground attack costs 20% for a few seconds, the boat costs 20% for the whole crossing,” and the longer the crossing, the more the boat’s effective cost rises well above its nominal 20%. This is the number most players never compute, and it is the number that turns a seemingly equal-coin flip into a clear choice in favor of the ground attack on any map with a long lane.

When to reach for a boat

The boat is the correct tool in a specific set of situations, and recognizing them is most of the decision. The first and most common is selective projection: you want to hit one enemy island or one specific front across water while deliberately not engaging the rest of the enemy’s border. Because a ground attack would spread across every shared border you have with that player, the only way to strike a single front in isolation is a boat. If the enemy holds three islands and you only want to take the weakest one, the boat is the only tool that lets you do that without simultaneously committing against the other two.

The second situation is breaking a concentrated defense at a point of your choosing. If the enemy has fortified one coast but left another open, a boat to the open coast lands on a shore the enemy did not prepare for, and the concentration of the boat’s full load on that one landing is exactly what beats a thin beach defense. The third is your own geography forces it: if you are on an island and the enemy is on the mainland (or vice versa), there is no land border to attack, so the boat is not a choice but the only available offensive tool across the water between you. The fourth is screening a lane with a warship makes the crossing cheap: if you can keep a warship in the lane and the enemy cannot contest it, the transit risk drops and the boat’s surprise advantage becomes almost free.

The pattern in all four is that the boat wins when the enemy’s defense is not where you are landing and water is the only or the preferred medium. If either condition fails — if the enemy has pre-positioned a thick defense on every shore you could land on, or if a land border is open and cheaper — the ground attack takes over. The boat is not a “stronger” version of the ground attack; it is a different instrument, and its advantage is entirely the advantage of choosing where your force lands.

A useful way to internalize the four situations is to ask, before you launch anything, whether the boat is buying you something a ground attack cannot. A ground attack can never give you isolation of one front — it is structurally committed to spreading across every shared border, so if your goal is “touch this one island and nothing else,” the boat is the only instrument that can do the job, full stop. A ground attack can never give you a landing on a shore the enemy left open — because a ground attack can only reach a shore the two of you already border on land, it is by definition aimed at a front the enemy expects and prepares. A ground attack can never cross a body of water that has no land bridge — there is simply no land border to push along. And a ground attack can never benefit from a screened lane the way the boat can, because a warship in the lane changes the boat’s calculus (it raises the transit risk, and a screened lane is also a sign the enemy values that water) but has no effect on a land push at all. So the honest question is not “is the boat stronger” but “am I trying to do something the ground attack is physically unable to do, and is the water cheap enough to make the transit worth it.” When both answers are yes, the boat is not just one option, it is the only option that fits, and the ground attack should not even be on the table.

When the ground attack wins

The ground attack is the correct tool whenever the two of you share a land border and you want to apply pressure, because it costs no transit, cannot be sunk, and the enemy’s defense along a shared border is exactly the front you are attacking — there is no mismatch between where you push and where they defend. If you border an enemy on land and also across a water lane, the ground attack along the land border is almost always the cheaper first move: it is immediate, it is readable to the enemy (which is not a problem when the front is what they expect you to hit), and it does not expose your home coast to a counter-invasion while your troops are in the water.

The ground attack also wins when the enemy is spread thin across many fronts. A boat concentrates your 20% on one beach, but if the enemy’s whole coastline is weak, a ground attack that spreads your 20% across the entire shared border is actually more effective, because it hits every weak point at once instead of just one. The boat’s concentration is a liability against a uniformly weak defense: you are delivering a chunk to one beach while the rest of the enemy’s coast goes unpunished. The ground attack’s distribution is exactly the shape that punishes a spread defense.

There is also a tempo argument: a ground attack is over quickly, so you can re-roll it the moment the front is broken, while a boat crossing takes the full transit time and you are committed for the duration. In a fast game where the enemy is rotating and re-fortifying between moves, the ground attack’s immediacy matters more than the boat’s surprise, because the window in which the boat’s landing is unopposed is shorter than the time it takes to cross the lane. The ground attack is the tool for tempo and land; the boat is the tool for concentration and water, and the boundary between them is the boundary between “we share a border on land” and “the enemy is across water on a front I want to choose.”

There is a fourth reason the ground attack wins that is easy to miss until you have played it: the enemy’s reaction is predictable, and predictability is a feature here, not a bug. Because a ground attack along a shared border is the one thing the enemy expects you to do, they will keep troops staged along that border, and that staging is exactly what you are attacking — there is no wasted effort on a front they did not prepare for, but also no surprise, and you should budget for the fact that the border will be contested from the first second. That is fine when your goal is to grind territory across a long front, because the contested border is precisely where the contested tiles are, and every push that breaks a section moves the border line. The trap would be to expect the boat-like surprise from a ground attack — it does not deliver one — and then to conclude the push is “too hard” when the border is simply doing what a prepared border does. The ground attack is the tool you reach for when you want the border to move, not when you want the enemy to be caught unaware, and recognizing which of those two goals you actually have is half of choosing the right tool. When the goal is movement along a front the enemy is already watching, the ground attack is not merely available, it is the cheaper and the faster way to get that movement, and the boat would only add a transit window and a warship target for no additional surprise.

The selective-strike framework: choosing one beach without paying for the rest

The boat’s defining power is the selective strike: hitting one part of the enemy across water while leaving the rest of the border alone. The framework for using it has three steps. First, read the enemy’s defense distribution. Are they thick on every shore, or thin on some? If thin on some, the boat is justified — you are going to land on a thin shore. If thick everywhere, the boat buys you nothing, because the landing will be contested exactly as hard as a ground attack would be, and you have added transit risk for no gain.

Second, size the boat operation to the shore you are landing on, not to the enemy’s total strength. The boat’s full load (up to 60% of your pool across three boats) should be compared against the troops the enemy has on the specific shore you are landing on, not against their army as a whole. If the enemy has 5,000 troops on the shore you are landing on and you send a single boat carrying 10,000 (20% of a 50,000 pool), you have a 2-to-1 on the beach, which is the ratio that wins land fights. If you instead sent three boats (30,000) into that same 5,000-troop shore, you over-committed: you spent three times the troops needed, and your home pool is three times thinner for no additional gain.

Third, keep the rest of the enemy’s border in mind as the cost of the selection. By striking one shore with a boat, you are not applying pressure to the others, so the enemy’s other fronts are free to rotate troops onto the landing shore or to attack your exposed coast. The selective strike is only rational if the shore you are landing on is soft enough that the enemy cannot reinforce it in time, or if your own home reserve is large enough that the enemy’s rotation onto the other fronts does not threaten you. The three steps reduce to one question: is the shore I am landing on soft enough that a boat-sized load wins the beach fight, and can I afford to leave the rest of the border unpressed while I land? If yes to both, the boat is the right tool; if no, the ground attack across the shared border (or no attack at all, and a wait for regrow) is the better call.

The framework also has a hidden fourth step that only becomes obvious once you are executing: decide in advance what you will do if the landing holds. A selective strike that wins the beach but leaves you unsure of your next move has wasted the surprise, because the enemy now knows exactly where your force is and how big it is, and the value of the boat was the unannounced insertion. So before you launch, you should already know whether the landed force will garrison the new island, push deeper into the enemy’s water, or fall back to reinforce the home coast, and the answer changes how much load you send. If the plan is to hold a small island as a forward position, a single boat is usually enough and you keep the home reserve high. If the plan is to use the landing as a beachhead for a follow-on second boat or a deeper strike, you need the first landing to be deep enough to absorb a counter-rotation, which pushes you toward two boats. In either case the point is the same: the selective strike is a decision about what the landing buys you next, not just about winning the beach, and players who treat it as only the beach fight tend to over-commit the load, take the beach, and then have no follow-through and no home reserve, which is the worst outcome of the three.

Scenario A: the selective island strike

You are on a large landmass. Your main enemy holds a cluster of three islands off your coast, and you have measured their garrisons: the nearest island has roughly 8,000 troops, the middle one 15,000, and the far one 40,000. You do not want to fight all three at once, and your own pool is 100,000. The ground attack is not available to you for these islands (they are across water, not on a shared land border), so the boat is the only offensive tool — but the question is which island and how many boats.

You pick the nearest island, the 8,000-troop garrison, because it is the softest and the shortest lane (least transit time, least exposure). You launch a single boat carrying 20,000 (20% of your 100,000 pool), leaving 80,000 home. The single boat is deliberate: 20,000 against 8,000 is a clean 2.5-to-1 on the beach, which wins the landing, and a single boat keeps your home pool at 80,000, so the enemy’s other two islands are free to rotate but you are still thick enough to hold your coast. If you had sent three boats (60,000) at the 8,000 garrison, you would have won the same beach with a 7.5-to-1 and left yourself at 40,000 home — the same island taken, but half your army spent and your coast exposed to a counter from the 40,000-troop far island. The selective-strike framework says: size the load to the shore, not to your pool, and keep the home reserve large enough that the unpressed fronts do not bite.

The reason the boat is the tool here is that it is the only tool that lets you take one island without touching the others. A ground attack would have spread your 20% across every shared border you had with the enemy (which, if the enemy also borders you on land, would mean committing against the mainland front you may not want to engage). The boat isolates the strike: you hit the soft island, the other two stay quiet or rotate slowly, and your 80,000 home reserve holds the coast. If the landing succeeds, you have an island to build from; if it fails, you have lost 20% but your 80,000 home pool means the game is still yours. The single most common error in this exact situation is to second-guess the 2.5-to-1 and send a second boat “just in case,” which quietly moves you from a clean selective strike to a two-front commitment that the enemy can read and answer.

Scenario B: the land-border pressure that should not be a boat

Now the mirror case: the same 100,000 pool, but this time your main enemy shares a land border with you along a long coastline, and they are spread thin across that border — roughly 10,000 troops distributed across the whole shared front. You want to apply pressure and take territory, and you are tempted to use a boat because the enemy is also across a water lane. This is the situation where the boat is the wrong tool.

Because the enemy is spread thin across the land border, a ground attack that spreads your 20% (20,000) across the entire shared front is exactly the shape that punishes a spread defense: every weak point along the border is hit at once, the enemy cannot concentrate against a single beach because there is no single beach — the attack is the whole front — and the ground attack is immediate, so you re-roll the moment a section breaks. A boat, by contrast, would concentrate your 20% on one landing tile, delivering a chunk to one point of a front that is uniformly weak, while the rest of the enemy’s coast goes unpunished. You would be using a precision instrument to do a sledgehammer job, and you would pay transit risk (a warship in the lane could sink the boat) for a landing that a ground attack would have taken for free and faster.

The decision flips here for the same reason it flipped in Scenario A, in the opposite direction: the enemy’s defense is spread, not concentrated at one shore, so the ground attack’s distribution matches the defense’s shape and the boat’s concentration does not. If the enemy had instead concentrated 40,000 on one specific shore and left the rest of the border empty, the boat to the empty shore would have been the obvious call — the distribution matches the situation, and the boat’s choice of landing is the whole advantage. The two scenarios are the same question asked in both directions: does the enemy’s defense match the tool’s shape? Ground attacks match spread defenses; boats match concentrated defenses with a soft, chosen landing point. In Scenario A the defense was concentrated at the far island and soft at the near one, so the boat’s single-lane concentration beat the thin near-island garrison; in Scenario B the defense was spread evenly across a land border, so the ground attack’s even distribution matched it and the boat would have over-concentrated on one section while the other sections stayed at full strength.

There is a further check worth running in this mirror case, because it is the one that most often trips up players who have just learned the boat’s value and now reach for it by habit: is there actually a water lane to the soft shore, and is it cheap? The ground-attack argument above assumes the enemy’s spread defense is along a land border you share. If instead the “spread thin” defense is on a coast that has no land connection to you — only a water lane — then the ground attack is not available and the boat becomes the only tool again, even though the defense is spread. In that variant the boat is not a precision instrument beating a concentrated defense; it is simply the only instrument that can reach the target at all, and the sizing rule still applies (size the load to the shore, keep the home reserve up), but the “boat vs ground” comparison collapses because there is no ground option to compare against. So the full decision is really three-way, not two-way: when a land border exists, compare the ground attack’s distribution against the defense’s shape and the boat’s concentration against it, and pick whichever matches; when no land border exists, the boat is the only tool and the only question left is sizing and timing. The mistake to avoid is applying the “boat beats spread defenses” intuition from Scenario B’s water-only variant to the land-border case and using a boat when a ground attack was the cheaper, immediate, transit-free option all along.

Failure modes and counters: when the boat bet is wrong

The boat bet fails in a few specific ways, and each has a counter you should run before you launch. The first is the warship in the lane: if the enemy has a warship screening the water between you and your target shore, its shells will sink your boat before it lands, and you will have deducted the full load from your pool for nothing. The counter is to check the lane before you launch, and if there is a warship, either bring your own warship to contest the lane or switch to the ground attack across the shared land border (which cannot be screened by a warship at all). A warship screen is the single most common reason a boat bet is wrong, and it is the reason the boat is not a default even when water is the medium.

The second failure is the nuke on the landing: if the enemy has a nuke aimed at the shore you are landing on, the landing site can be erased to water, which triggers the boat’s automatic retreat at a 25% malus on the load. The counter is to read the enemy’s nuke posture before you choose a landing shore — if their silos are aimed at your likely beach, pick a different shore or wait for the warhead to be spent. The third failure is over-committing the load: sending three boats at a shore that one boat would have taken, leaving your home pool too thin to hold the coast against the enemy’s rotation. The counter is the selective-strike sizing rule from the framework: size the load to the shore’s garrison, not to your pool. A fourth, quieter failure is ignoring the unpressed fronts: the moment you commit to a boat landing, the enemy’s other borders are free, and if your home reserve is thin, the enemy can counter-invasion your coast while your boats are in the water. The counter is to keep the home reserve large enough (at least as much as you are sending, more if the enemy has an active front of their own) so that the unpressed fronts cannot reach your coast before the boats land.

Tying the four together, the pre-launch checklist for a boat is: Is the lane warship-clean, or do I have a warship that can contest it? Is the landing shore not nuke-aimed? Is the load sized to the shore’s garrison, not my pool? Is my home reserve large enough to hold the coast against the enemy’s unpressed-front rotation? If all four are yes, the boat is a sound bet. If any is no, the answer is usually to switch to the ground attack across the land border, reduce the load, or wait for regrow — not to push the boat anyway on the assumption that the landing will hold.

Mode and map adjustments, and the decision table

The boat-vs-ground decision is the same everywhere, but the defaults shift with mode and map, so adjust the numbers you carry. On team modes (Four Islands and similar), the water lanes are shorter and the enemy’s defense is more predictable, so a single-boat selective strike is often the whole operation, and the home reserve you keep is mostly there to cover your teammate’s back. On large FFA maps, the boat’s risk is higher: the moment you commit to a crossing, another player can invade your exposed coast from a different direction, so the home reserve on a large FFA map is what keeps you alive, and the ground attack across a shared land border is the safer default when you are not certain the lane is clean.

Map shape drives the crossing time, which drives the limbo window, which drives how much the boat’s transit risk matters. On a map where the lane you need to cross is a short strait, the committed troops are in limbo for seconds and the home front is exposed briefly, so the boat’s surprise advantage nearly always outweighs the small transit risk. On a map with a long open-ocean lane, the same boat sits in limbo for minutes, and the whole game can shift — the enemy can rotate a warship into the lane, aim a nuke, or counter-invasion your coast — while your army is on the water; on those lanes, the ground attack across a shared border is the better tool whenever it is available, and the boat is reserved for the cases where water is the only medium.

Situation	Right tool	Why
Enemy across water, one soft shore, rest thick	Boat (sized to the shore)	Concentrates load on the chosen soft landing
Enemy across water, whole coast uniformly thin	Boat only if no land border; otherwise wait	Concentration over-pays on a spread defense
You and the enemy share a land border, enemy spread thin	Ground attack	Distribution matches a spread defense; no transit risk
You and the enemy share a land border, enemy concentrated one shore	Boat to the empty shore (if water route exists)	Choice of landing beats the concentrated front
Enemy warship screens the lane	Ground attack (or contest the lane first)	Boat is sunk in transit; ground cannot be screened
Enemy nuke aimed at your landing shore	Different shore, or wait, or ground	Nuke erases the landing; ground has no landing to erase
Long open-ocean lane, uncertain enemy	Ground attack if land border exists	Limbo window too long; transit risk too high

The table is the quick reference to use before you press either attack. It maps the situation you are reading to the tool that matches the enemy’s defense shape. The whole page reduces to one line: boats concentrate on a chosen landing and are the tool for water and selective strikes; ground attacks spread across the shared border and are the tool for land and tempo; and the right one is the one whose shape matches the shape of the enemy’s defense.