Shame on you! You get a C+ for today's Texas History lesson! :)
This apparently was a real incident: http://www.txdps.state.tx.us/director_staff/texas_rangers/
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"The often cited "One Riot, One Ranger" appears to be based on several statements attributed to Captain McDonald by Albert Bigelow Paine in his classic book, Captain Bill McDonald: Texas Ranger. When sent to Dallas to prevent a scheduled prize-fight, McDonald supposedly was greeted at the train station by the city's anxious mayor [who had sent for a company of Rangers], who asked: "Where are the others?"
"To that, McDonald is said to have replied, "Hell! ain't I enough? There's only one prize-fight!"
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The interesting thing is that history records that Ranger McDonald *did* successfully supress the prize-fight and potential riot - alone.
LOL!