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The original was posted on /r/todayilearned by /u/RippingLegos__ on 2025-05-06 00:04:24+00:00.

Original Title: TIL that in 1809, the Austrian army accidentally attacked itself during the Battle of Wagram. Confused by darkness and miscommunication, one unit mistook another for the enemy — and launched a full-on assault. Over 10,000 men were involved in the chaos.