Wladyslaw Sikorski, a veteran of the First World war, the Polish-Ukrainian war (1918-1919) and the Polish-Soviet war (1919-21) was between September 1939 and July 1943 the Prime Minister of the Polish government-in-exile in London and supreme commander of the Polish forces in the West. He revived the Polish army, which was in ruins and also took great pains to strengthen the Polish position within the Allied powers. Wladyslaw Sikorski lost his life on the fourth of July, 1943 in a plane crash in Gibraltar. To this day there are still many question marks about the background and cause of this accident.