Battle of the Plaza

True West magazine has an article by Bob Boze Bell about the famous shootout:

April 16, 1881: Traveling mostly by rail, Bat Masterson has just covered eleven hundred miles to come to the aid of his estranged brother Jim. Bat was in Tombstone, in the Arizona Territory, with Wyatt Earp when he received word of threats against his brother’s life.
As the Dodge City-bound train pulled into the depot from the west, Bat swung down off the train on the north side of the tracks. It is about noon. His intuition told him his brother’s enemies may attempt to round him up at the depot. He scanned the train platform and the busy streets looking for trouble. As the caboose passes, he noticed two men on the opposite side of the tracks, walking toward the depot. Bat immediately recognized both men and shouted: “Hold up there a minute, you two. I want to talk to you.” Lady Gay Saloon owner A.J. Peacock and his brother-in-law, bartender Al Updegraff, take one look at the familiar stocky figure striding toward them and turn on their heels, ducking behind the corner of the jail. Jim was partners with Peacock in the saloon, and the two had disagreed over firing Updegraff, a dishonest drunk in Jim’s eyes.
All parties pull weapons and begin to bang away at each other. (It’s unclear which side fired first.) Bat retreated to the railroad track’s three-foot berm and hid behind it.
Bullets snapped over Bat’s head and thudded into Dr. McCarty’s drugstore on the north side of Front Street. Bat returned fire, knocking huge splinters of wood from the corner of the hoosegow. Soon, Bat is fired upon from several south-side saloons as “deadline partisans” join the fray. The compliment is returned from the north side of the tracks as friendly fire (probably from Jim and his friends) ripped into the south-side buildings.
Bullets careened into the Long Branch Saloon, sending patrons scrambling out the back door. Owner Chalk Beeson sought refuge behind the door of his safe. George Hoover’s saloon lost a window, and a bullet tore a newspaper from an idler’s hands.
Amidst the wild firing, Updegraff suddenly pitched forward as a bullet ripped through his chest. Not long after, Bat and Peacock ran out of bullets. Mayor A.B. Webster ran up and stuck a Fox shotgun barrel in Bat’s face. Learning from the mayor that his brother is alive, Bat surrendered and handed over his empty six-guns.
A hearing was held, and formal charges were brought against Bat Masterson. The complaint stated that “W.B. Masterson did... unlawfully and feloniously, discharge a pistol upon the streets of said city.” Bat pled guilty and was fined eight dollars in costs. Jim Masterson dissolved his partnership with A.J. Peacock, and both brothers left town on the evening train. The Ford County Globe claimed: “They were allowed to leave town, with the understanding that they were not to return.”
Al Updegraff insisted Bat hadn’t shot him. Writing in his hometown paper, the Medicine Lodge Index (later reprinted in the Ford County Globe), Updegraff claimed: “We were then fired at by parties from the saloon doors on the north side of Front Street, from one of which I was shot through the right lung.” Although he survived his chest wound, Updegraff died two years later, of smallpox.

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