This Star Wars t-shirt shows the Battle of Hoth in a snow globe, as AT-AT walkers fire at snowspeeders. The shirt reads Merry Sithmas. When AT-AT walkers made their attack on Echo Base on the ice world Hoth, this became the single worst battlefield defeat suffered by the Rebel Alliance during the Galactic Civil War. The power generator was destroyed and Darth Vader was able to enter the base.