besieger

例句：

1. 1. The besiegers were determined to break through the city walls.
   围攻者决心突破城墙。
2. 2. The besiegers were forced to retreat after a long siege.
   围攻者在长时间的围困后被迫撤退。
3. 3.The besiegers were able to capture the castle by using a clever strategy.
   围攻者通过巧妙的策略成功占领了城堡。