sentences:  On May 4, 1861, in a response to President Abraham Lincoln's call to arms the U.S. War Department directed New Jersey to fill a quota of three infantry regiments to serve a three-year term of enlistment.Recruitment took place for the new regiments all over the state, and on May 21, the 1st New Jersey Volunteer Infantry was mustered into the Union Army at Camp Olden in Trenton under Maj. Theodore T. S. Laidley of the United States Regular Army.The 9th New Jersey Volunteer Infantry, under Col. Joseph W. Allen at Camp Olden, was the last New Jersey regiment to leave the state in 1861 but the first committed to battle.