The island fell on August 17, 1943, thirty-eight days after the initial landings. This was faster than some planners had expected, though it involved hard fighting, particularly in the northeastern corner of the island where the Germans conducted a disciplined fighting withdrawal to Messina and evacuated the bulk of their forces to the Italian mainland.
The assessment of Mincemeat’s contribution to this outcome has been the subject of considerable analysis. The official British history of strategic deception, written by Michael Howard, concluded that Mincemeat was a significant success. Howard’s view, drawing on the full documentary record available to an official historian with security clearances, was that the operation had meaningfully affected German defensive dispositions and contributed to the relative ease of the Allied lodgment in Sicily.
The claim that is sometimes made in popular accounts — that Mincemeat saved tens of thousands of lives — is not one that can be established with any precision. Military operations involve so many variables, and the counterfactual (what would have happened without Mincemeat) is so difficult to construct with confidence, that any specific number is speculative. The prompt for this article explicitly cautions against inventing or repeating exact numbers of lives saved, and that caution is well-founded.
What can be said with reasonable confidence is that the operation contributed to a better outcome than the worst-case scenarios had predicted. The German forces that were deployed to Greece and Sardinia in response to the Mincemeat material were not available to reinforce Sicily. The uncertainty about Allied intentions that the deception had generated meant that German reserves were not optimally positioned when the invasion came. These factors contributed to Allied forces establishing themselves ashore more quickly and with fewer initial casualties than might otherwise have occurred.