Fuuny story about this film

I've heard this story several times and read about it once, so I suspect it's fairly accurate. Both Peter O'Toole and Richard Burton were notorious drinkers. That, of course, is well know. But when they were making this film, they were relatively young. In this film, there were many older actors, which Burton and O'Toole had great respect for. There was, of course, John Gielgud, but also many others. These were the actors which Burton and O'Toole grew up admiring, and they were determined to be on their best behavior, which they were for the shooting of the film. But shortly after the film, the director wanted them back for a re-shoot of several different scenes. This time, the elder statesmen were gone, and Burton and O'Toole were no longer constrained in any way. They came to the set roaring drunk. They kept falling off their horses and laughing hystericallty. And in the scene in which O'toole puts the ring on Burton's finger, they had to keep re-shooting it because he kept missing Burton's finger. And off camera, there were two extras trying desperately to hold Burton and O'Tool's bodies steady. There were other incidents I've heard of. But these are the ones I remember