this is a fairly common mistake. While the Invaders series retconned a lot of things and told stories set in the 1940s, it wasn't the first time the heroes actually met up. All-Winners Comics #01 (Summer 1941) features a text story where all the main players at the time meet. This includes Cap, Namor, and the Human Torch, among others. in All-Winners Comics #19 (Fall 1946) we actually get a story featuring the team (although the bulk of it is told through individual stories, the team as a whole does bookend the plot. All-Winners Comics #21 tells a tale with a similar setup.