AT-PTs were made to take single troopers into intense combat situations on their own. They stood only 3 meters tall, and were driven by AT-PT pilots.
The AT-PT was--compared to its intended threat, enemy soldiers--heavily armored, enough so that most small-arms fire couldn't penetrate the craft's armor. The walker was armed with twin blaster cannons and one concussion grenade launcher, which were only effective against infantry. The walker's superior agility made up for its light armor (in comparison to most other cavalry units).
The AT-PT was designed decades before the Clone Wars, but during the wars, the Republic found a need for a small, anti-personnel walker, and the AT-PT became more relevant. It was one of the earliest AT series transports.
Edited by calebexo01, 30 March 2009 - 04:08 PM.