No, Erich Ludendorff did not warn against the danger of Hitler. The famous general who did was actually General Ludwig Beck. He was a senior German military officer and one of the main planners of the failed coup plot against Hitler known as the "July 20 Plot" in 1944. Beck recognized Hitler's dangerous policies and expanding ambitions and actively worked to resist and overthrow him. However, the plot failed, and Beck was executed for his involvement.
