How will a naval blockade actually work? War Sails Q&A Time!
When a force besieges a coastal settlement and has ships available, a blockade is automatically formed once the siege camp is established.
Maintaining a blockade introduces new risks and decisions. Enemy naval parties may attempt to aid the defenders — the besieging player must then choose to engage in a naval battle or withdraw. Victory keeps the blockade intact; defeat lifts both the blockade and the siege; withdrawing preserves the land siege, but allows enemies to reinforce the town by water.
The player can also attempt to reinforce a besieged town from the water — either by breaking through the blockade at the cost of some troops, or by attacking the fleet directly to lift it.