No. Overlord was promised and planned before. It was continually postponed. The decisions necessary to start were made in Teheran. In many countries it is taug

No. Overlord was promised and planned before. It was continually postponed. The decisions necessary to start were made in Teheran. In many countries it is taught in schools that allies were simply taking their time, waiting for the lowest risk/highest return moment. That is one version.