Poland: WW II: 1

From Wikipedia:
"Polish contribution to World War II"

 The European theatre of World War II opened with the German invasion of Poland on Friday September 1, 1939 and the Soviet invasion of Poland on September 17, 1939. The Polish Army was defeated after more than a month of fierce fighting. After Poland had been overrun, a government-in-exile (headquartered in Britain), armed forces, and an intelligence service were established outside of Poland. These organizations contributed to the Allied effort throughout the war. The Polish Army was recreated in the West, as well as in the East (after the German invasion of the Soviet Union). Poles provided significant contributions to the Allied effort throughout the war, fighting on land, sea and air. Notable was the service of the Polish Air Force, not only in the Allied victory in the Battle of Britain but also the subsequent air war. Polish ground troops were present in the North Africa Campaign (siege of Tobruk); the Italian campaign (including the capture of the monastery hill at the Battle of Monte Cassino); and in battles following the invasion of France (the battle of the Falaise pocket; an airborne brigade parachute drop during Operation Market Garden and one division in the Western Allied invasion of Germany). Polish forces in the east, fighting alongside the Red army and under Soviet command, took part in the Soviet offensives across Belarus and Ukraine into Poland, across the Vistula and towards the Oder and then into Berlin. Some Polish contributions were less visible, most notably the prewar and wartime deciphering of German Enigma machine codes by cryptologists Marian Rejewski and his colleagues. The Polish intelligence network also proved to be of much value to the Allied intelligence. Unlike in France, the Nazis did not set up a collaborationist government. Instead Poland was governed directly by a purely German administration known as the Generalgouvernement. This administration was in turn opposed by the Polish Underground State, which not only fielded one of the three largest partisan forces in existence, but was a rare example of an underground government, a phenomenon not witnessed in many other occupied countries. The Polish forces as a whole are considered to have been the 4th largest Allied army in Europe, after the Soviet Union, United States and Britain.

^ I am including several articles on Poland during World War II to show the whole picture of what the different kinds of people in Poland as well as Poles outside of Poland went through during the German and Soviet Occupations of Poland during the War. ^

 https://en.wikipedia.org/wiki/Polish_contribution_to_World_War_II