High Quality Content by WIKIPEDIA articles! No. 300 (Polish) "Land of Masovia" Bomber Squadron (Polish: 300 Dywizjon Bombowy "Ziemi Mazowieckiej") was a Polish World War II bomber unit. It was fighting alongside the Royal Air Force and operated from airbases in the United Kingdom. Already before the outbreak of World War II, the Polish government signed an agreement with the Royal Air Force. According to the appendix to the Polish-British Alliance, should the war with Germany break out, two Polish bomber squadrons were to be created on British soil. However, following the German invasion of Poland and subsequent Soviet invasion of Poland, most of Polish airmen who managed to get to the west were incorporated into the Polish Air Forces being created in France. It was not until the fall of France that Polish airmen started to arrive to the United Kingdom in large numbers.