Cap, the Torch and Namor battle nazis on the high seas in this early INVADERS cover. My favourite bit is the flipped over nazi that Cap has just decked. Frank Giacoia inks the image.
The art for this cover is currently being auctioned at Heritage Comics, already out of most people's price range, I'm sure. Check their site for a large scan, which is missing the cover blurb so you get some more details on U-Man's leg.