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.
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"Had King Kong showed up in Texas, Frank Hamer would have taken him down with his Model 8 in .35 Remington...well, he was kind of big, so maybe his BAR"