4th Moroccan Mountain Division (4 DMM) and the 1st Free French Division (1 DM). Clark also paid tribute to the Goumiers and the Moroccan regulars of the Tirailleur units: On 15 May, the British 78th Division with an attached armoured brigade under command came into the British XIII Corps line from reserve passing through the British 4th Infantry Division's bridgehead to execute the turning move to isolate Cassino from the Liri valley. On 17 May, General Anders led the Polish II Corps in launching their second attack on Monte Cassino. Under constant artillery and mortar fire from the strongly fortified German positions and with little natural cover for protection, the fighting was fierce and at times hand-to-hand. With their line of supply threatened by the Allied advance in the Liri valley, the Germans decided to withdraw from the Cassino heights to the new defensive positions on the Hitler Line. In the early hours of 18 May the British 78th Division and Polish II Corps linked up in the Liri valley west of Cassino town. On the Cassino high ground, the survivors of the second Polish offensive were so battered that "it took some time to find men with enough strength to climb the few hundred yards to the summit." A patrol of Polish 12th Podolian Cavalry Regiment finally made it to the heights and raised a Polish flag over the ruins. The only remnants of the defenders were a group of thirty German wounded who had been unable to move. Aftermath Hitler Line Units of the Eighth Army advanced up the Liri valley and Fifth Army up the coast to the Hitler defensive line (renamed the Senger Line at Hitler's insistence to minimise the significance if it was penetrated). An immediate follow-up assault failed, and Eighth Army then decided to take some time to reorganize. Getting 20,000 vehicles and 2,000 tanks through the broken Gustav Line was a major job taking several days. The next assault on the line commenced on 23 May with Polish II Corps attacking Piedimonte San Germano (defended by the redoubtable German 1st Parachute Division) on the right and 1st Canadian Infantry Division (fresh from Eighth Army reserve) in the centre. On 24 May, the Canadians had breached the line and 5th Canadian (Armoured) Division poured through the gap. On 25 May the Poles took Piedimonte and the line collapsed. The way was clear for the