On Wednesday July 3, 1940, Winston Churchill had a decision before him as hard as any he ever had to take in his long career of statesmanship. If the Vichy French fleet stationed at Oran in Algeria were to fall into German hands, as seemed highly likely, it would, when combined with the German and Italian navies, pose an existential threat to his country, which after the Fall of France was already gearing itself up for the Battle of Britain.
The French admiral would neither hand his fleet over to the Royal Navy, scuttle it, nor sail it to Canada. So, after some anguished heartache, the lifelong Francophile Churchill ordered it to be sunk, which it was with the loss of 1,299 French sailors.
There are some moments in history when a sudden act of opportune ruthlessness readjusts the world toward a safer path.