What would you guys consider the biggest strategic mistakes of World War 2? Here are 4 that I think are key: 1. Germany's Invasion of Russia 2. Germany's Declaration of War on U.S. 3. Japanese Pearl Harbor Attack 4. Germany's Failure to Eliminate the RAF Here's why: The Four Biggest Strategic Mistakes of World War 2 What do you guys think? Are there some other big blunders that come to mind? Any Allied strategic blunders of note?