Smith acknowledged Thursday that he had been fined, but he didn't reveal the amount.
"I received a letter from the NFL office this morning," Smith said. "I want to reiterate that I'm always going to have my players' backs and I'm going to take care of them."
The trouble started Sunday after Landry delivered a late hit on Falcons quarterback Matt Ryan along the Atlanta sideline. Landry and Ryan quickly hopped up and headed back to their respective huddles, but Hall jumped into the middle of things and was surrounded by Falcons players, along with Smith and Fish.
Hall said that Smith "cussed me out" and Fish tried to "get some licks in" during the scrum, though replays showed no apparent punches during the pushing and shoving. Smith has maintained that he was just trying to break things up, though he was clearly upset about the hit on Ryan and Hall jumping into the fray.
Hall joined the Redskins last season after playing for the Falcons from 2004 to 2007. In the week leading up to the game against his former team, the two-time Pro Bowler repeatedly talked of being unfairly treated by the Falcons before they traded him to the Oakland Raiders. Hall didn't make it through one season with the Raiders and wound up with the Redskins.
Hall declined to speak with reporters as he walked off the practice field Thursday. Later, he publicly responded through Twitter, thanking the fans, his teammates and the Redskins for supporting him.
"I've tried to keep my nose clean n (sic) play the game the right way," Hall wrote. "Last weekends (sic) incident was unfortunate for everyone involved but the past is the past, and I'm excited about getting back to FedEx Sunday!!"
The Associated Press contributed to this report.