Ground Assault was the second installment of the Star Wars PocketModel TCGTM trading card game. Released on November 14, 2007, itintroduced an additional one hundred-twenty cards and thirty six styrene sheets—collectively printed with 67 units—to the game. Units included ship classes from the original and prequel films, as well as from the Expanded Universe, representing Rebel, Imperial, Republic, and Separatist forces. A stand-alone release, ownership of the Base Set was not required for game play, although cards and units from both sets were interchangeable. This expansion included ground units, such as AT-ATs and Spider Droids, and new rules for the use of ground units.