Horatio Gates Sickel (April 3, 1817 – April 17, 1890) was a Union Army officer during the American Civil War. He served in the Pennsylvania Reserves during the first part of the war and later commanded brigades in western Virginia and at Petersburg, where a serious wound ended his military career. Early life Sickel was born April 3, 1817, in Bucks County, Pennsylvania. He belonged to a family of Dutch settlers who had emigrated to the area with William Penn. He was also distantly related to Revolutionary War general, Horatio Gates, from whom he received his namesake. Sickel spent his early life as an apprentice in coach making and manufacturing lamps. He served as a captain in the state militia prior to the war. Civil War In 1861 Sickel volunteered for the Union army and was appointed captain (May 27) then colonel (July 28) of the 3rd Pennsylvania Reserves. Sickel and his regiment joined the Army of the Potomac on the Virginia Peninsula in time for the Seven Days Battles. He led his regiment credibly at Mechanicsville and Gaines' Mill, receiving commendations from his brigade and division commanders, George G. Meade and George McCall. He continued in command of the regiment through the battles of Second Bull Run and Fredericksburg. Shortly after Fredericksburg, he succeeded Meade in command of the Pennsylvania Reserve Division. Sickel and his division were stationed at Alexandria, Virginia on guard duty. While many of the Pennsylvania Reserves rejoined the Army of the Potomac for the Gettysburg campaign, Sickel stayed behind as commander of a brigade in the Department of Alexandria. Sickel did not see action again until the Spring of 1864 when he was ordered to join the forces of George Crook operating in western Virginia, where he commanded the 3rd Brigade of Crook's Kanawha Division. At the Battle of Cloyd's Mountain, he led his men in a charge against the Confederate breastworks which succeeded in turning the enemy's flank. The following month the three-year enlistments of the 3rd Pennsylvania Reserves ran out. Sickel and the rest of his men were mustered out of the volunteer services on June 17, 1864. He immediately reenlisted and was appointed colonel of the 198th Pennsylvania Infantry. This command was ordered to the Petersburg front and upon arrival there, Sickel was placed in command of the 1st Brigade in the 1st Division of the V Corps. Two weeks later Sickel