Sentence:  Thus at the same time that William Henry Harrison was preparing to pacify the aborigines of Indiana Territory and winning fame at the <WSD>battle</WSD> of Tippecanoe , Anglo-Saxon settlement made a great leap into the center of the North American continent to the west of the American agricultural frontier . 
Meaning of the word marked with <WSD> tags:  a hostile meeting of opposing military forces in the course of a war