 In January 1940 604 moved to RAF Northolt and flew Blenheims adorned in the Finnish Air Force "Swastika" to Finland via Sweden to assist the country after the Soviet invasion.Cunningham was promoted to flight lieutenant on 12 March 1940.In April the squadron flew as escort for a De Havilland Flamingo carrying Winston Churchill, First Lord of the Admiralty, to Paris to attend a meeting after the German invasion of Denmark and Norway.