The mistake was Eisenhower's. After the Allies scored victories in North Africa and Sicily, the next step was the continent, but where? It was decided to keep the landing destination secret. Even the preliminary bombardment of the beaches by naval guns was eliminated, at great risk to the troops landing. But anybody with a simple compass could draw a circle centered on the nearest Allied air bases in Sicily and come to the conclusion that the only suitable harbor within round-trip distance was the port of Salerno.
Salerno was to be taken by the first totally integrated Anglo-American force. The American contingents chosen for the landing were the Texans of the 36th Division, totally inexperienced in battle, and another National Guard Division, the 45th, largely drawn from Oklahoma and New Mexico.