All Terrain Siege Platform

The All Terrain Siege Platform, also called the Terran Siege Walker, and nicknamed the "Big Gun," was a six legged combat walker in service during the Clone Wars. It saw service in both the Terran Republic and the Galactic Empire.

Much larger than its template, the Galactic Republic's All Terrain Tactical Enforcer, the AT-SP was designed to bring the power of a Star Destroyer to a battlefield. To make up for its slow speed, the AT-SP was equipped with a deflector shield.

History
Several AT-SPs were responsible for trapping 10,000 clone troopers on Endor in 21 BBY.

One AT-SP was intended to be deployed in the Battle of Hoth as clean-up after the battle, but since the shield was up, the AT-SP was never seen.