"The success of Operation Cobra provided the Allies with an opportunity to cut off and destroy most German forces west of the River Seine. American, British and Canadian armies converged on the area around Falaise, trapping the German 7th Army and elements of the 5th Panzer Army in what became known as the Falaise pocket. On 20 August Generalfeldmarschall Walter Model ordered a withdrawal but by this time the Allies were already blocking his path. During the night of 19 August, two battle groups of the Polish 1st Armoured Division (Maajor-General Stanisław Maczek) had established themselves in the mouth of the Falaise pocket on and around the northernmost of the two peaks of Mont Ormel ridge.
On 20 August, with his forces encircled, Model organised attacks on the Polish position from both sides of the pocket. The Germans managed to isolate the ridge and force open a narrow corridor. Lacking the fighting power to close the corridor, the Poles directed constant and accurate artillery fire on German units retreating from the pocket, causing heavy casualties. The Germans launched fierce attacks throughout 20 August which inflicted losses on the Poles on Hill 262. Exhausted and dangerously low on ammunition, the Poles managed to retain their foothold on the ridge. The following day, less intense attacks continued until midday, when the last German effort to overrun the position was defeated at close quarters. The Poles were relieved by the Canadian Grenadier Guards shortly after noon; their stand had ensured the closure of the Falaise pocket and the collapse of the German position in Normandy."