Grapple

When a ship in the battle nav portion of a sea battle has another ship right next to its broadside, that ship may choose to grapple the other ship. When this happens, the swordfighting portion of the sea battle begins.

Most battle navvers try to load the opposing ship full of shot before grappling them, so that they start the swordfighting portion of the sea battle with a large amount of unbreakable black blocks.