Operation Avalanche was disagreement between the Allies as to what the next step should be. Winston Churchill in particular wanted to invade Italy, which he called the "underbelly of Europe" (commonly misquoted as "soft underbelly"). Popular support in Italy for the war was declining, and he believed an invasion would remove Italy, and thus the influence of the Italian Navy ("Regia Marina") in the Mediterranean Sea, opening it to Allied traffic. This would make it much easier to supply Allied forces in the Middle East and Far East, and increase British and American supplies to the Soviet Union. In addition, it would
Operation Avalanche tie down German forces, keeping them away from the planned invasion of Normandy – Operation Overlord. However, General George Marshall and much of the American staff wanted to undertake no operations that might delay the Normandy invasion. When it became clear that Operation Overlord could not be undertaken in 1943, it was agreed forces in North Africa should be used to invade Sicily, with no commitment made to any follow-up operations. Joint Allied Forces Headquarters AFHQ were operationally responsible for all Allied land forces in the Mediterranean theatre and it was they who planned and commanded the invasion of Sicily