Privateer: Privately owned vessel a state at war to attack enemy ships, usually merchant vessels.

武装民船： 为交战国征用以攻击敌方船只（常是商船）的私有武装船只。

youdao

Anakin, however, was drawn from the battle by a sleek rogue vessel that flew apart from the enemy swarm.

但是一艘落单的流线型飞船从敌机群中穿出，把阿纳金引离了战场。

youdao

Designed for commando and espionage operation, the main strength of a covert ops vessel is the ability to travel unseen through enemy territory and avoid unfavorable encounters.

主要用于侦察行动，其主要长项是能够隐身穿越敌战区，避免不必要的遭遇战。

youdao

During an assault on a target, for instance a shore landing, the vessel is responsible for providing a sustained attack on an enemy.

BBC: News | In Depth | Military Fact Files