 Complete the following phrase:  The operation went ahead as planned, with Penneys 1st Division landing in the northern sector of Anzio, catching the Germans completely by surprise. However, the corps commander, Lucas, decided instead to consolidate his beachhead before following Alexanders instructions to drive for the Alban Hills. The German response was swift, with Generalfeldmarschall Albert Kesselring, C-in-C of German Army Group C, ordering all local troops, as well as reinforcements from Germany and France, forward to oppose the Allied landings at Anzio. In this way, by 26 January, four days after the operation started, opposing the Allies at Anzio were elements of six German divisions. At the same time, on the main front at Cassino, the British X Corps, under Lieutet General Richard McCreery, and US II Corps, under Major General Geoffrey Keyes, launched their own 