Brave and the Bold #167 (1955 1st Series)

At midnight on September 19th 1944, in an alley in Gotham City (behind Marko Labs), Batman jumps a quintet of Nazi–looking equipment thieves, and dishes out some mayhem, but they all manage to scramble into their waiting truck and drive away, tossing a potato-masher grenade at Batman as they leave; At dawn that same day, the Blackhawk Squadron all land outside Warsaw, and fight their way into town on foot, with tommy guns and fists; The next evening, at the Dorsey Club in Gotham City, Bruce Wayne sees the bat-signal outside, ditches his date, changes identities, and visits Commissioner Gordon. Back-Up, Nemesis recalls how he and his brother both became FBI agents and how he was forced to leave the agency after his brother murdered his superior, Ben Marshall.