With no sign of a breakthrough it was decided to attempt to outflank the Winter Line with an amphibious landing behind it. Operation Shingle involved landings at Anzio on the West coast on 23 January 1944. The assaulting formations were controlled by the U.S. VI Corps, but as with Salerno, there was a substantial British component to the assault force. The British 1st Infantry Division and 2nd Commando Brigade formed the left flank of the assault.