(Apologies for the huge thread drift, but the thread title is "On this Day".)
... and on this day in 1941, (to almost audible sighs of relief all round in beleagured Blighty), Herr Hitler made what was quite possibly his biggest mistake in WW2 in launching Operation Barbarossa. Six weeks late thanks to the Balkan/Greek sideshow forced upon him by the Allied... (call it what you will) into Greece.
Which would be correct if today was 22 June.