Sentence:  McGuire took the two of them out to Kidman's Bore on the Sylvester River where about two dozen stockmen from different stations had gathered to tend the <WSD>muster</WSD> along the edge of the Simpson Desert. 
Meaning of the word marked with <WSD> tags:  A roundup of livestock for inspection, branding, drenching, shearing etc. (from 19th c.)