THE YEAR WAS
"Infested With Spies"
Written by S. R. Powell(writer and artist)
Mystery Men Comics #21 - The agents of Prussland have infested America's capital and after one such agent attacks D-13's boss, his mission becomes to hunt out the leader. That results in his leading an attack on a Prussland "airplane carrier" and other ships to slow down their upcoming invasion.
Here are the pages I have of it.