Suicide unit

Suicide Units are a branch of units in Age of Empires II and Age of Empires III who self-destruct when used. Hence, they can only be used once. They hold a great attack and deal splash damage. Also, they have an attack bonus against buildings.

Age of Empires II
In Age of Empires II, there are essentially two suicide units, one of them being an evolution of three units:
 * Petard
 * Demolition Raft -> Demolition Ship -> Heavy Demolition Ship

Also, there is the Saboteur, an improved version of the Petard only available in the Scenario Editor and a few campaign scenarios. It is also a Cheat Unit.

Age of Empires III
Just like in the previous version, there are two suicide units in Age of Empires III, one on the land and the other one on the water:
 * Petard
 * Fire Junk