The seizure of Chambois by American, Canadian and Polish forces saw the final closure of the Falaise Pocket on August 21, 1944 and the destruction of most of Army Group B.On August 18, 1944, Canadian forces captured Trun, while General Stanisław Maczek's Polish 1st Armoured Division headed towards Chambois to encircle 110,000 Germans in the Falaise pocket.Chambois had been heavily shelled and was in ruins with German soldiers from various battered units flowing into the area.German troops and vehicles were trapped on the congested narrow roads and were easy prey for Allied artillery and air attacks.Remnants of German units retreated east towards the Seine but left much of their heavy armour and artillery behind.