At the Battle of Tanga in 1914, the British army in East Africa was defeated by bad planning, arrogance, racial prejudice... and the accidental disturbance of several hives of angry African bees.
Having been roused by the noise of battle and the bullets in the air around them, the bees emerged in massive clouds - and most of them, as luck would have it, swarmed enraged towards the British lines, engulfing the Indian and British troops in a furious cloud of stinging, buzzing anger. Some of them were refreshingly impartial, attacking the Askari tribesmen who were aiding the Germans, but most were focused on the British lines - one engineer was stung 300 times!
Following this dismal failure, the British commander General Aitken was returned to Britain, reduced to Colonel, and then retired on half-pay.
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Why so serious?