The above word being used in its most positive sense, that is, when describing a British Army officer who fought the whole of World War II with a broadsword and longbow as his personal weapons (!!!). (Also a set of bagpipes, but let’s not go there. He wasn’t even Scottish.)
Here’s “Mad Jack” Churchill’s story (watch the video first), and his boring Wikipedia entry. “War hero” doesn’t even begin to describe a man who was decorated four times for bravery under fire. He should have got the V.C. and probably would have, except that the world ran out of wars for him to fight.
Read and watch it all.