Originally, the brigade's exclusive mission was to drop into occupied Poland in order to help liberate the country. The British government, however, pressured the Poles into allowing the unit to be used in the Western theatre of war. Operation Market Garden eventually saw the unit sent into action in support of the British 1st Airborne Division at the Battle of Arnhem in September 1944. The Poles were initially landed by glider from 18 September, whilst, due to bad weather over England, the parachute section of the Brigade was held up, and jumped on 21 September at Driel on the South bank of the Rhine. The Poles suffered significant casualties during the next few days of fighting, but still were able, by their presence, to cause around 2,500 German troops to be diverted to deal with them for fear of their supporting the remnants of the 1st Airborne trapped over the lower Rhine in Oosterbeek.