There is the famous case in the Korean War at the Battle of Imjin River where the British commander of the Gloucestershire regiment reported to an American General, 'Things are a bit sticky, sir'. The American General thought that meant a good thing, like they were holding the line, when in fact they were fighting a heroic last stand outnumbered 25:1!

https://www.warhistoryonline.com/korean-war/battle-of-imjin-...