Each side has 2 Dreadnoughts (5HP, move 7), 3 Cruisers (2HP, move 10), a Dock and a 1HP Landing Ship (move 10).
Select a ship, then tap empty water to preview the route and destination; tap the destination again to move. Selecting another ship cancels the preview. Tap an enemy ship to attack. Each mobile ship may act once per turn.
The Landing Ship cannot attack. Move it beside an unoccupied island, then on your next turn tap the island to build a 3HP Shorefort with one interceptor battery. Shoreforts can attack enemies within range.
Shoreforts count as units and keep the battle going if your other ships are destroyed.
Your next available unit is selected automatically. When all eligible units have acted, the enemy's turn starts immediately.
Every eligible unit must act within 30s, or your Dock loses 1HP and the turn ends.
On the enemy's turn your Dreadnoughts, Dock and Shoreforts auto-launch interceptors at missiles that come within 8 cells. Each hit knocks out one battery if the unit has one.