services and were accepted by the Union Army. In 1862, five companies of the 2nd Massachusetts Cavalry (also known as The California 100 and the California Cavalry Battalion) were enrolled and mustered into service, and sent to Massachusetts. They left San Francisco by sea for service in the east. The California Battalion consisted of Companies A, C, F, L, and M. They participated in 51 battles, campaigns, and skirmishes. Oregon U.S. Senator Edward D. Baker raised a regiment of men on the East Coast. These units and others were generally known as the "California Regiment", but later designated the 71st Pennsylvania Infantry. Col. Roderick N. Matheson was the leader of the 32nd New York Infantry, also known as the 1st California Regiment. In October 1861, Colonel Baker was authorized to increase his command to a brigade. The additional regiments were commanded by Colonels Joshua T. Owen, DeWitt Clinton Baxter, and Turner G. Morehead, all from Philadelphia, respectively designated the 2nd, 3rd, and 5th California Regiments. The 4th California Regiment, as planned, was composed of artillery and cavalry. These troops were soon detached. After Baker was killed in the Battle of Ball's Bluff, Pennsylvania claimed these four infantry regiments as a part of its quota, and they became known as the "Philadelphia Brigade" of Pennsylvania Volunteers. They were initially commanded by Brig. Gen. William W. Burns and first served in John Sedgwick's Division of the II Corps, Army of the Potomac. They had a distinguished service career, highlighted by their actions at the Battle of Antietam and their prominent position in the defense against Pickett's Charge at the Battle of Gettysburg. Military units associated with California included: Los Angeles Mounted Rifles (Confederate) Monte Mounted Rifles (Confederate) Captain Ingram's Partisan Rangers (Confederate) Mason Henry Gang (Confederate) 2nd Regiment of Cavalry, Massachusetts Volunteers Company A, E, F, L, and M (the later four called the "California Battalion") 32nd Regiment of New York Volunteers "Philadelphia Brigade" of Pennsylvania Volunteers 1st California Infantry - 71st Pennsylvania Infantry 2nd California Infantry - 69th Pennsylvania Infantry 3rd California Infantry - 72nd Pennsylvania Infantry 5th California Infantry - 106th Pennsylvania Infantry Regiments of the California volunteers in federal service The California Volunteer units recruited 15,725 volunteers for Federal service. Nearly all served inside California and in the Department of the Pacific and the Department of New Mexico. These units included two full regiments and one battalion of Native