他被一个无法具名的青年袭击。

He was ___assaulted by a youth who cannot be named.

我记得有一次我父母阻止了三个小流氓袭击一个女孩。

I remember that once my parents prevented three hooligans from ___assaulting a girl.

士兵们在黎明时袭击了敌军阵地。

The soldiers ___assaulted the enemy position at dawn.