Gamma Base

Gamma Base is the name of a Rebel base on an unknown icy planet (much like Rhen Var or Ando Prime), perhaps Hoth; in which case it could be the name of one Echo station.

It was attacked by Imperial forces and AT-ATs while Rookie One served there, but he managed to shoot one walker with his Snowspeeder and escape along with the rest of the Rebel fleet.

Behind the scenes
Gamma Base is just an alternate reality Echo Base. Why the Battle of Hoth should be present in Rebel Assault is a blooper made by the game designers. Fans like to think that either the section should be dismissed as non-canon, or that Gamma Base belongs to another Rebel planet, albeit too similar to Hoth.

Note that the game documentation states that the planet appearing in the game is indeed Hoth, not a different planet, showing that continuity was not a concern during designing that game. So we can either just ignore the manual statement and accept that the icy planet is just an unknown planet, or accept all events of the game as canonical, except of course the timeframe they are given.

Whether we can accept the existence of Gamma Base altogether depends on whether we decide to believe the existence of a Rebel base on that Hoth-like icy planet before the Battle of Yavin, or accept the Base as being a part of or contemporary to the well known Echo Base.

See also: Rookie One for another discussion on this.

Appearances

 * Rebel Assault