Colt Walker of Texas had been the major purchaser of the early Paterson Holster Pistol (No. 5 model), a five shot cal .36 revolver, and Samuel Walker became familiar with it during his service as a Texas Ranger. In 1847, Walker was engaged in the Mexican-American War as a captain in the United States Mounted Rifles. He approached Colt, requesting a large revolver to replace the single-shot Aston Johnson holster pistols then in use. The desired .44-.45 caliber revolver would be carried in saddle mounted holsters and would be large enough to dispatch horses as well as enemy soldiers. The Colt Walker
Samuel Colt was exonerated and the story became national news when "Scientific American" reported that the fault was not with Colt, but with Washington politicians. With a virtual monopoly, Colt sold his pistols in Europe, where demand was high due to tense international relations. By telling each nation that the others were buying Colt's pistols, Colt was able to get large orders from many countries who feared falling behind in the arms race. A key element to Colt's success was vigorous protection of his patent rights. Even though he lawfully held the only patent on a revolver, scores of imitators copied his