7.3 Mad Bomber, 7.3 Sledgehammer. My ally and I had hit a planet with a counterattack post earlier and dealt with the 5,000 unit counterattack wave pretty handily, so we decided to go for it with this one after saving the game. Shot the command post, and uh... we lol'ed. No wave modifiers or anything, no clue why they ended up with 60,000k incoming ships instead of 5,000.