The wormhoudt massacre occurred during a battle that brought land operations on the Western Front to an end until what date?
Wormhoudt massacre: The Wormhoudt massacre (or Wormhout massacre) was the mass murder of 80 British and French POWs by Waffen-SS soldiers from the 1st SS Division Leibstandarte SS Adolf Hitler during the Battle of France in May 1940. Battle of France:  In six weeks from 10 May 1940, German forces defeated Allied forces by mobile operations and conquered France, Belgium, Luxembourg and the Netherlands, bringing land operations on the Western Front to an end until 6 June 1944.
6 June 1944