Sometimes it's a lot more peaceful than others. My two week olds are doing well with this, and in my older flock, a gentle peck is usually all I see -- never anything violent. About the worst that happens is one chases another, and they have a short run without contact but with appropriate screeches -- for show, I think. If I watch my young bunch closely, there will be a small peck or bump now and then.
I have one who tends to be the bully, will harass a broody on her nest etc. -- so I "peck" her, with my foot or a stick -- of course I don't hurt her, I barely have to touch her to get the message across, and sometimes just a swipe in her general direction is enough. The other day I was several feet away and threw a little piece of an apple core at her, which landed rather softly on her back; I wasn't sure she would even be able to feel it. She ran screeching from the coop and didn't bother the broody again, that day.
The few I've had who were really rough on others aren't here any more.