Sentence:  ... Tanacharisson ... complained very much of the behavior of Colonel Washington to him ... saying that he took upon him to command the Indians as his slaves, and would have them every day upon the <WSD>outscout</WSD> and attack the enemy by themselves, and that he would by no means take advice from the Indians ... 
Meaning of the word marked with <WSD> tags:  A group of advance scouts; an advance scouting party.