1. The Dieppe Raid Fiasco (1942)
During World War II, the Dieppe Raid resulted in catastrophic losses for Allied forces, yet initial reports downplayed the scale of the disaster. Nearly 60% of the 6,000-strong invasion force was killed, wounded, or captured. The Allies hushed up operational failures, only later admitting to tactical blunders and intelligence flaws. For more details, refer to the BBC article on the Dieppe Raid.
