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Background
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The game had a special significance for both teams, as there had been a bench-clearing brawl in a Rangers/Indians game one week earlier at Arlington Stadium in Texas, during a "cheap beer night" there.<1>
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The game
Early in the game, the Rangers took a 5-1 lead. Meanwhile, throughout the contest, the crowd in attendance, which was already heavily inebriated, grew more and more unruly. A woman ran out to the Indians' on-deck circle and flashed her breasts, and a naked man sprinted to second base as Grieve hit his second home run of the game. A father and son pair ran onto the outfield and mooned the fans in the bleachers one inning later. The ugliness escalated when Cleveland's Leron Lee hit a line drive into the stomach of Rangers pitcher Ferguson Jenkins, after which Jenkins dropped to the ground. The fans in the upper deck of Municipal Stadium cheered, then chanted "Hit 'em again! Hit 'em again! Harder! Harder!"
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The riot
In the ninth inning, a fan attempted to steal Texas outfielder Jeff Burroughs' cap. Confronting the fan, Burroughs tripped, and Texas manager Billy Martin, thinking that Burroughs had been attacked, charged onto the field, his players right behind, some wielding bats.<2> A large number of intoxicated fans – some armed with knives, chains, and portions of stadium seats that they had torn apart – surged onto the field, and others hurled bottles from the stands. WJW producer Tony Lolli then suspended the station's live telecast of the game. Realizing that the Rangers' lives might be in danger, Ken Aspromonte, the Indians' manager, ordered his players to grab bats and help the Rangers. Rioters began throwing steel folding chairs, and Cleveland relief pitcher Tom Hilgendorf was hit in the head by one of them. Hargrove, involved in a fistfight with a rioter, had to fight another on his way back to the Texas dugout.
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The bases were pulled up and stolen (never to be returned) and many rioters threw a vast array of objects including cups, rocks, bottles, batteries from radios, hot dogs, popcorn containers, and folding chairs. As a result, umpire crew chief Nestor Chylak, realizing that order would not be restored in a timely fashion, forfeited the game to Texas. He too was a victim of the rioters as one struck him with part of a stadium seat, cutting his head.<3> His hand was also cut by a thrown rock. He later called the fans "uncontrollable beasts" and stated that he'd never seen anything like what had happened, "except in a zoo".<4>
http://en.wikipedia.org/wiki/10_Cent_Beer_Night