The Texas Rangers are a law enforcement agency NOW, but for most of it's existence in the 19th century it was an army, ruled over by the governor. Most of their successful activities dealt with bandits, Mexicans who had the nerve to come into Texas to raid or steal, many times ignoring the sovereignty of Mexico.(the federal government of Mexico had little or no control of the north, which is why most of the revolutions in Mexico stated there). They were immune from prosecution, like the labor riots in Dallas illustrate. One riot, one ranger- just they don't tell you how that ranger did it. Hint: We used to call it "lead persuasion". Hell the more you know about the laws on the books in Texas, the more you should be concerned. The governor can declare an emergency and put 12,000 troops on the border, including tanks,(300 M1A2), merchandised infantry,(600 M2 APCs) Engineers and all the rest that goes into an army division. The Texas guard has around 70 helos, all newer than the regular army. 1000 guys is only around 8% of the guard force. Can Guardsmen arrest some one? Look at this way, if a guy with body armor with a automatic weapon says get on the ground, you will. Don't forget, around 1100 guardsmen are also law enforcement officers.