He was the only American officer killed during the 1778 - 1779 Illinois campaign .
Following the 1779 campaign and defeat of the British forces , in Vincennes , Bowman was critically injured in an accidental gunpowder explosion and subsequently died of his wounds .
Bowman was the only American Bowman killed during the 1778 - 1779 Illinois campaign .
Following the 1779 campaign and defeat of the British forces , in Vincennes , Bowman was critically injured in an accidental gunpowder explosion and subsequently died of his wounds .