The All Terrain MegaCaliber Six (AT-M6),[1] also known as the Gorilla Walker[3] or First Order Heavy Assault Walker,[4] was a mobile heavy artillery walker used by the First Order during their war with the Resistance.[5] As the biggest walker in the First Order's arsenal, the AT-M6 was much larger than the All Terrain Armored Transport used by the Galactic Empire,[3] and was operated by specialist First Order Walker Drivers, who were responsible for the use of the machine's most prominent feature, a single MegaCaliber Six turbolaser cannon mounted to its back[1] for which the walker was named.[6]


The design of the AT-M6 was one part siege walker the other a means of physcological warfare. The massive height of the walker, imposing arms, and terrifying noises could break whole armies before its weapons came into range. The First Order researchers found how to change the walker frame in order to install the giant cannon by reinforcing the front legs. This gave the walker stability and the look of a giant simian predator. The walker was covered in state of the art Ultra-dense matrixed composite armor.[2]

The walker's main purpose was as a siege platform. The MegaCaliber Six turbolaser cannon could punch through planetary shields. This huge power required auxillary fuel cells to reduce the recharge time.[2]


All Terrain MegaCaliber Six walkers were used in the Battle of Crait against the Resistance.

In the years following the collapse of the Galactic Empire and the capture or destruction of most of its industrial capabilities by the New Republic, the First Order sought a successor to the original Imperial All Terrain Armored Transport. This eventually led to the development of the AT-M6.[source?]

One of the AT-M6's most notable deployments was during the Battle of Crait, shortly after the death of Supreme Leader Snoke and the ascension of Kylo Ren as leader of the First Order. A number of these walkers led the charge against the Resistance base on the planet Crait, along with a pair of First Order All Terrain Armored Transports and Ren's Upsilon-class command shuttle, with numerous TIE/fo space superiority fighters and TIE/sf space superiority fighters providing air support.[7] Before that, they were deployed to Vardos to put down their former allies after Gleb's death.[8]

After the majority of Resistance speeders and ground troops were destroyed and the remainder forced to withdraw to the heavily armored confines of the base proper, the AT-M6s participated in the bombardment of the Force projection of Jedi Master Luke Skywalker, who had come to confront Ren, his fallen apprentice. However, the laser cannons of the walkers had no effect on the illusion.[7]

Behind the scenes[]

AT-M6 cross section

The All Terrain MegaCaliber Six was first officially revealed on The Star Wars Show on August 23, 2017, alongside the First Order Dreadnought. It was created for the 2017 film Star Wars: Episode VIII The Last Jedi, directed by Rian Johnson, as the First Order variant of the All Terrain Armored Transport of the Galactic Empire, being larger and more stable.[source?] Johnson noted he aimed to have the AT-M6 resemble a gorilla.[9]

A scale model of the All Terrain MegaCaliber Six, alongside several other models and props, was placed on display in the Star Wars Launch Bay attraction during the Galactic Nights event on December 16, 2017, as part of the promotion for the then-recently released movie The Last Jedi.[10]


Non-canon appearances[]


Notes and references[]