Tense rivalries often spark some of history’s most compelling alliances. Sometimes, bitter enemies find themselves forced by circumstance to unite against a greater threat. These rare moments of cooperation can change the course of wars, reshape nations, and forge uneasy bonds. Here are fifteen memorable instances when sworn foes set aside old grudges to stand shoulder-to-shoulder on the battlefield—proving that sometimes, necessity really does make for the strangest bedfellows.
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