Joseph Bowman kept a daily journal of his trek from Kaskaskia to Vincennes , which is one of the best primary source accounts of Clark 's victorious campaign .
He was the only American officer killed during the 1778 - 1779 Illinois campaign .
officer   kept a daily journal of officer 's trek from Kaskaskia to Vincennes , which is one of the best primary source accounts of Clark 's victorious campaign .
He was the only American officer killed during the 1778 - 1779 Illinois campaign .