What are some notable blunders in history that resulted in huge loss?

Bady@lemmy.ml to Asklemmy@lemmy.ml – 306 points –

Loss in terms of money or efforts. Could be recent or ancient.

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The Battle of Manzikert led directly to the end of the Roman Empire, all because of mismanagement.

Battle of Manzikert

If I saved one person the 4 calories worth of finger movements required to open a new tab and Google this themselves then I'll go to sleep happy.

Bah! I'm in the habit of spending those calories (history nerd) and did so before reading your comment. Still, your comment is appreciated. Also, thanks to @Cleverdawny for clueing my into something I hadn't known.