Its main focus is Sullivan Hill, a 1,400-foot (430 m) wooded hill that was fortified by the Iroquois in a bid to ambush Sullivan's column. The main trail followed by Sullivan's troops had to pass near the steep hillside, which was only 1,000 feet (300 m) from the river. Sullivan's advance forces discovered the Iroquois works, and Sullivan set up his artillery on a rise to the south, from which it could command not just Sullivan Hill but also another hill to the east.