User blog comment:Master Sima Yi/Assassinews 03-03-'13 — Assassin's Creed IV: Black Flag trailer and screenshots/@comment-5019018-20130323205028/@comment-3046679-20130325031405

Two ships. Two ships by firing on powder kegs. You just aim the salve right before the ship so it just grazes the front rather than hit it fully, and exposes the point.