Bettany, 34, spent three days attempting to 'beat up' the INDIANA JONES actor in choreographed shots, but insists the 63-year-old actor is unbreakable in a fight.
Bettany says, "I was just trying not to get bruised. I wouldn't want to tumble with Harrison Ford in real life. He's a tough son of a bitch.
"I threw that man through a window seven times and he landed on his head, got up, rebuilt the window with the crew and then got thrown through it again.
"I hit that man in the stomach and he said, 'Could you just land it a bit harder so I could feel it?' So I landed it a bit harder and he wanted a bit more so he could react to it.
"Finally, I just wound one up and let loose on him and he said, 'That's it!'
"It was the most humiliating day of my life."