Sentence:  The sheriff and District Attorney Mills hastily swore out a number of warrants against men who had been <WSD>riding</WSD> about armed , according to signed statements by Chavez and Dr. I. P. George , and ordered Deputy Barney Clark of Raton to rescue the posseman . 
Meaning of the word marked with <WSD> tags:  sit and travel on the back of animal, usually while controlling its motions