It's interesting that a couple if centuries before antiseptics were not used treating Civil War wounds in the US, the doctor treating Prince Hal seemed to be aware of the necessity of cleanliness.
It is suggestive. But it could also be the difference between treating a single VIP casualty and 5,000 in a single day. Imagine how much white wine the Army of the Potomac would have had to carry to cleanup after another debacle against Lee & Jackson?
I read, during the 15th century, there was a potent incantation to say over a wound. Recovery was in the 80% range.
Oh yeah, it also included, almost as an afterthought, the instructions to thoroughly cleanse the wound, wrap it in clean linen and leave it alone. No cow dung or other such salves. :-)
Another one was, if possible, treat the weapon that caused the wound the same way as the actual wound itself. No success rate was mentioned for that one. Distantly related to the anti-gunners claim that the gun itself causes crime.