Lego Star Wars 4489 Mini-AT-AT Walker from "The Empire Strikes Back" is a miniature version of the AT-AT Walker. It is one in the series of Mini Building Sets from Lego. Extra pieces are included in this set, as with purchases of three additional (4488, 4490, and 4491) sets. Collecting all four sets, and combining the extra pieces included, allows you to build the bonus MINI Y-Wing. It was a formidable behemoth war machine of the Imperial fleet. The AT-AT standing at a staggering height of 22.5 meters, was a heavily armored vehicle. Although, a slow moving machine, nevertheless, it struck fear in hearts of the enemy. Most certainly a force to be reckoned with, demoralizing the enemy and literally crushing everything in its path. The AT-AT was used to transport Imperial troops and light vehicles into the combat zone. It can accommodate up to forty Stormtroopers or Imperial Assault Troopers and five Speeder bikes.