Saw a little of it last night. On a par with "SS Doomtrooper" I would say. Which is to say: Not good!
Shooting down Jerry fighter planes with mortars is a good idea, though. I don't know why our boys didn't actually try that in the war. Got him with their first shot, too. Must be a good mortar. In most games I've played I can never hurt anything on the ground with a mortar, let alone something flying about at 300mph! :

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