For, on that day, Poland — personally led by its king — rode to the rescue of our Civilisation at the gates of Vienna.
(Details — and movie, here; also see on Complacency Day, here.)
Be it solemnly moved that from this day forward, we shall remember:
Complacency Day, Sept 10;
9/11-01, Sept 11;
Sobieski Day, Sept 12.
I close with a paraphrase from Santayana and others: those who refuse to learn the lessons of history are doomed by that folly to repeat its worst chapters. END
PS: Summary video on the charge:
This gives broader background: