MASON SPRINGS, Md. (AP) _ A longstanding feud between two men escalated from an argument to a gun battle in a crowded bar that left 11 people injured, and one man was charged Sunday, police said.

The shootout at the Mattawoman Seafood Restaurant in this Charles County town about 20 miles south of Washington, D.C., involved a shotgun and possibly two or three other guns, said Detective Robert Cleaveland of the Charles County Sheriff's Department.

''The best that I understand is that it is a feud between'' the two men, ''not family for family,'' he said. The two men have a history of arrests, some stemming from past confrontations, he added.

Other people in the bar apparently pulled out their own guns when the shooting started late Friday, Cleaveland said.

''You have to understand the particular area and the clientele we're dealing with. It appears at this point that some of the people do (carry guns),'' he said. But most were ''purely victims who were caught in the crossfire.''

''We have shootings here, just like anywhere else, but this is out of the ordinary,'' Cleaveland said.

Mark Mondell Baker, 18, of Glymont, was arrested after being released from Physicians Memorial Hospital in LaPlata where he was treated for pellet wounds to the back, legs and back of head, Cleaveland said.

Baker was charged Sunday with assault with intent to murder, Cleaveland said. He did not release the name of the other man involved in the feud.

Handgun violation charges were pending against other people, Cleaveland said.

Three of the injured remained hospitalized Sunday with shotgun pellet wounds. The others were treated and released by Saturday afternoon, said Detective Sgt. Joseph Montminy.