Was the union jack used as a battle ensign at any time in WW ll?

Yes, the Union Jack was used as a battle ensign during World War II, primarily by the Royal Navy. It was flown on naval vessels to signify their nationality and was often displayed in various military operations. However, the more commonly used naval flag for operational purposes was the White Ensign, which featured the Union Jack in the canton. The Union Jack's role as a national symbol was prominent throughout the war, even if it wasn't the primary battle flag.