Stalingrad. The Germans got so swept up in conquering a city of little strategic importance that their eventual defeat there may have well cost them the war despite making headway throughout the rest of Russia. That's what we're doing arguing about stuff like this.
I was thinking the IJN off of Guadacanal, but I see your point.
NRA Life Member
Big Sister: "You should be sponsored by Allen"
Me: "If you can't shoot good, at least look good walking to the firing line."
Big Sister: "Can you not afford a Pelican? Then buy an Allen gun bag."