SUPERMAN DAILY STRIP #397-414 (by Jerry Siegel and Joe Shuster)
An old-school Prohibition-era gangster is back in town, and he leads his gang in a raid on an arms warehouse full of army ordnance. Superman races to stop them, and even though they attack him with a tank they can't defeat him. This was short and sweet. There's not a lot to it, but I did enjoy the villain, Dinelli. He's got a very direct approach to problems that makes for a fun bad guy.
SUPERMAN SUNDAY STRIP #19-30 (by Jerry Siegel and Joe Shuster)
The European fake country of Carolia is being invaded by its neighbour Bangol. A Carolian writer goes to the US to try and raise funds for the war effort, but Bangol spies try everything in their power to thwart him. Enter Superman, who stops the writer's ship from being bombed, exposes a fake charity being used to divert funds away from Carolia, and defends a charity circus. It's not a great Superman story, but the circus sequence is a lot of fun. And Superman is at his Golden Age murdering best, which I always find entertaining.