During this battle , the 1st , 3rd , and 4th U.S. Army Ranger battalions , the 83rd Chemical Mortar Battalion , and the 509th Parachute Infantry Battalion , which had been brigaded as the 6615th Ranger Force ( Provisional ) , were assigned to support the renewal of an attack by the 3rd Infantry Division , which had previously failed to take Cisterna from 25-27 January .
During this battle , many US Ranger groups were ordered to support an attack by the 3rd Infantry Division on Cisterna .