Wow there's a few things in this thread that dance rather lightly over historical facts about the Italian campaign, Normandy invasion and all of the political/economic/production aspects of reality 1942-4.
1. Soviet pressure for the western Allies to open a second front as soon as possible. Granted an invasion in France would fit this requirement, but not any invasion, only one with a realistic chance of success.
2. Early invasion of France/Western Europe - Plans were made for joint operations shortly after the US entry into the war. Operation Sledgehammer was to be carried out in early autumn 1942 in the event the USSR was on the verge of collapse. The Brits would provide 6 divisions, the US could only provide about 3, and the plan was to attack the Contentin peninsula (Cherbourg) and hold a perimeter until the following spring where additional forces would be landed. Operation Roundup was the plan for an invasion in spring of 1943, drawn up by Eisenhower, for the invasion between Boulogne and Le Harve, would require 48(!) divisions. Normandy used only 39 divisions. As a side note, in January 1944 half the required US troops for D-Day were in Britain. How would those troops (and more) been able to be used in the fall/winter/spring of 42-43......
3. Casablanca Conference - the decision to prioritze Italy, made jointly by US/UK.
4. The Italian Campaign - the invasion of mainland Italy wasn't a separate, independent part of the war and needs to be seen in the overall picture. Completion of Operation Torch, the invasion of North Africa, was delayed until Maj 43. Given the numbers of men required for Operation Roundup, one would think that all units involved in Torch would be needed for Roundup. Since Torch only ends in Maj 43, how would you have done Roundup ?
5. Advantages of the chosen strategy -
- Doable
- Tied German forces down, away from both the Eastern Front and the invasion areas of Normandy
- Applied pressure to and eventually forced one of the Axis coalition partners out of the war
- Ultimately ended with the unconditional surrender of all German forces in northern Italy, before Germany itself capitulated.
6. Problems with the Italian Campaign - It was never meant to be the main axis of engagement against Germany. Resource priority always went to Overlord, and subsequently to Dragoon as well. In other words, the bare minimum resources were kept in Italy to keep the Germans occupied. The progress of the campaign, while not impressively fast, was probably the best that could be achieved with the available resources.
7. Resources - contrary to popular belief, the arsenal of Democracy and the UK did not have limitless resources to fight both in Europe and the Pacific. Choices had to be made, and we must assume here 70+ years later that those choices were based upon the best information available at the time, the political realities of the situation and were taken by some of the best minds available. Hindsight is a wonderful thing, but only works one way.