After World War II ended, the war-time heroes known as the Invaders returned to the States and renamed themselves the All-Winners Squad. They remained active throughout the early 1950's.
Originally, the All-Winners Squad only made two appearances in 1950's publications: All-Winners Comics #19 and #21 (no #20 was ever released). Therefore, the majority of the team's history has been told through various flashbacks.
Other members unrelated to the X-Men include Captain America II and III, Bucky II, Human Torch, Toro, and one-time associates like the original Angel and the Blonde Phantom.