“You must absolutely halt at Clos Vougeot; for, such is the honour in which we hold it, that when a Regiment on march gains first sight of the Clos, the officer in command gives order to present arms, as though the nation itself were doing homage to the superior Sovereignty of this noblest of all grapes.”

Other, similar accounts make no mention of Napoleon initiating the tradition, though it continued at least into World War I.

Sorry. I’m not usually like this, but I’ve been doing some related research and this was close at hand.