The battle was initiated when a pair of three-man United States Marine Corps STA (Surveillance, Target, and Acquisition) teams in Haditha were surprised and overrun by a small insurgent force.Two days after the killings, Marine forces launched Operation Quick Strike to disrupt insurgent presence in the Haditha area.On the second day of that operation, a Marine Amphibious Assault Vehicle hit a large roadside bomb, killing 15 out of the 16 on board.On the morning of 1 August 2005, a pair of three-man USMC Reserve STA teams on the outskirts of Haditha was attacked by a small insurgent force from the Ansar al-Sunna group and in moments was overrun.Small Craft Company USMC assisted in locating the bodies of the slain snipers and were engaged in a large fire fight on the east bank of the Euphrates River in the city of Haditha.On 1 August 2005, Lima Company, 3/25 had detained two "military-aged" males in the home next to the site where the snipers had been killed and had found large quantities of blood in the house.