 Early on 19 August , <unk> Simonds met with his divisional commanders to finalize plans for closing the gap . The 4th Armoured Division would attack toward Chambois , on the western flank of two battlegroups of the Polish 1st Armoured Division . Two additional Polish battlegroups would strike eastward , securing Hill 262 to cover the eastern flanks of the assault . The 2nd and 3rd Infantry Divisions would continue their grinding offensives against the northern extremities of the Falaise Pocket , inflicting heavy casualties on the exhausted remains of the 12th SS Panzer Division . The assault began almost immediately after the meeting , with one battlegroup of the Polish 1st advancing toward Chambois and " Currie Task Force " of the 4th Armoured Division covering their advance . Simultaneously , two Polish battlegroups moved for Hill 262 . Despite heavy German resistance , Battlegroup <unk> was able to secure Point 137 , directly west of Hill 262 . By early afternoon , Battlegroup Stefanowicz had captured the hill , annihilating a German infantry company in the process . As a result of the fighting , Polish casualties accounted for nearly 50 % of those sustained by the Canadian 1st Army . 
