Bader had his first taste of combat with No. 222 Squadron RAF, which was based at RAF Duxford and commanded by another old friend of his, Squadron Leader "Tubby" Mermagen. On 10 May the "Wehrmacht" invaded Luxembourg, the Netherlands, Belgium and France. The campaigns went badly for the Western Allies and soon they were evacuating from Dunkirk during the battle for the port. RAF squadrons were ordered to provide air supremacy for the Royal Navy during Operation Dynamo.