


Particularly well-documented was the service of 145 Polish pilots flying British planes under British Command during the Battle of Britain, 79 in mixed squadrons under the RAF after July 1940, 32 in wholly Polish Squadron 303 after 31 August 1940 and 34 in entirely Polish Squadron 302. In the west, 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 an armored division in the Western Allied invasion of Germany). Polish forces in the east, fighting alongside the Red army and under Soviet high command, took part in the Soviet offensives across Belarus and Ukraine into Poland and across the Vistula and Oder Rivers to the Battle of Berlin. Poles made substantial contributions to the Allied effort throughout the war, fighting on land, sea, and in the air.

In World War Two, the Polish armed forces were the fourth largest Allied forces in Europe, after those of the Soviet Union, United States, and Britain. Demonstration of Zygalski sheets (perforated sheets)
