Occupying defensive Defending positions throughout the lava beds south of Tule Lake ( in present-day Lava Beds National Monument ) , those few warriors resisted Defending for months the more numerous United States Army forces sent Sending against them , which were reinforced Cause_change_of_strength with artillery .

The US Army forces tried to dislodge Removing the Modoc from the natural fortress , now called Request Captain Jack 's Stronghold , in the lava beds along the south shore of Tule Lake in northeastern California .