Military history is filled with bold plans that looked promising on paper but ended in disaster. Some failed because of poor leadership, others because of bad intelligence, overconfidence, or simple miscommunication. These operations and battles changed wars, toppled empires, and became lasting examples of how quickly military fortunes can unravel.
#1: The Roman Defeat at Cannae (216 BC)
The Battle of Cannae (216 BC) stands as one of the greatest tactical defeats in Roman history. Facing Hannibal during the Second Punic War, Roman commanders relied on superior numbers and pushed aggressively forward. Hannibal anticipated this move and surrounded them using a double-envelopment strategy. Trapped on all sides, tens of thousands of Romans were killed in a single day.
