This title is, objectiveluy and overall, really bad. But this story is kind of neat. The Invaders meet The Crusaders, who consist of a bunch of DC analog characters–a bird-guy, a sea, guy, etc. But in the same months, DC published Freedom Fighters #14 and 15, which featured a team of DC heroes who were analogs for Marvel ones. And both books took place during WWII.
Okay, so it’s not really a crossover.
On the letters page of #14, Marv Wolfman resolves some Baron Blood questions.