Something I learned is that the common perception is that the Germans invading Greece and Yugoslavia delayed Barbarossa was not true.
In fact, Barbarossa was delayed because of the rainy Spring season in Poland, which delayed the Germans moving their troops and equipment to the Russian border, and that it had little to do with going into Greece and Yugoslavia.
I had read elsewhere that the delay in attacking the USSR in 1941 was not caused by Hitler’s decision to attack Yugoslavia (he was mad about the coup that ousted Prince Paul, but the new government promised to observe the agreement that Paul had made with Germany), despite the myth. But I was not aware of the rainy weather in Poland being the real reason.
“In fact, Barbarossa was delayed because of the rainy Spring season in Poland, which delayed the Germans moving their troops and equipment to the Russian border, and that it had little to do with going into Greece and Yugoslavia.”
Yes, the flooding was unusual that spring. The Germans had their Balkan operations wrapped up well before the end of May. Plenty of time to redeploy.