Scotland did not enter World War II as an independent actor. As a constituent nation of the United Kingdom, it fought alongside England, Wales, and Northern Ireland as part of the Allied powers from September 3, 1939, following the UK's declaration of war on Nazi Germany after the invasion of Poland.
Clydebank Blitz (March 1941) devastated the town. Rationing, blackout, evacuation of children to Highlands. Polish forces reconstituted in Scotland after fall of France.
War accelerated Scottish industrial decline but also forged political consciousness that fed later devolution movements. The Scottish National Party founded 1934; first MP elected 1945.