AT-ST

An AT-ST is a fictional land vehicle featured in the Star Wars multimedia franchise. It is also known by its full designation, All Terrain Scout Transport, but has also been informally referred to as an Imperial Walker. These four-legged behemoths of destruction were utilized by the First Galactic Empire in their ongoing battle against the Alliance to Restore the Republic.

Films

 * 1) Star Wars Episode V: The Empire Strikes Back - Only 1 AT-ST.
 * 2) Star Wars Episode VI: Return of the Jedi - At Least 4 AT-STs.
 * 3) Rogue One: A Star Wars Story - Only 1 AT-ST.