Sentence:  Before daylight <WSD>Sunday</WSD> morning , a posse of twenty-three men under the leadership of Deputy Sheriff Frank MacPherson of Catskill followed the trail to the house of Francisco Chaves , where 100 to 150 Mexicans had gathered . 
Meaning of the word marked with <WSD> tags:  first day of the week; observed as a day of rest and worship by most Christians