That same day, units from the 1st Battalion, 24th Infantry Regiment, known as "Deuce Four", fought against the insurgents in the vicinity of the Yarmuk traffic circle, in the heart of western Mosul. The battle lasted throughout the day and the insurgents proved to be both determined and coordinated. The 3rd Battalion, 21st Infantry Regiment, known as "Gimlets" to the north was hammered with mortars while insurgents attacked from the west, east, and south with small arms fire, RPGs, and machine gun fire.