John Grubb Parke (September 22, 1827 – December 16, 1900) was a United States Army engineer and a Union general in the American Civil War. Parke's Civil War service was closely associated with Ambrose E. Burnside, often serving him as chief of staff in major engagements such as Antietam, Fredericksburg and the Overland Campaign. Parke also held significant field commands during Burnside's North Carolina Expedition, Vicksburg and the battle of Fort Stedman as well as brief stints in command of the Army of the Potomac. Early life Parke was born in Coatesville, Chester County, Pennsylvania, to Francis G. and Sarah Parke. He graduated from the United States Military Academy in 1849 and was commissioned a brevet second lieutenant in the Corps of Topographical Engineers. As an engineer, he determined the boundary lines between Iowa and the Little Colorado River, surveyed routes for a railroad from the Mississippi River to the Pacific Ocean, and was the chief surveyor of the party charged with the delineation of the boundary of the northwest United States and British North America, 1857–1861. Civil War At the start of the Civil War, Parke was appointed brigadier general of volunteers and commanded a brigade in the operations on the North Carolina coast in early 1862. He received a brevet promotion for the Battle of Fort Macon and was promoted to major general of volunteers on July 18, 1862. In the Army of the Potomac, Parke served briefly as commander of 3rd Division, IX Corps. Then he served as chief of staff to Maj. Gen. Ambrose Burnside during the battles of Antietam and Fredericksburg. He assumed command of the IX Corps and was sent to the Western Theater for the Vicksburg Campaign. Parke then was Burnside's chief of staff in the Army of the Ohio in the defense of Knoxville. Parke served as chief of staff to Burnside during the Overland Campaign, in which the latter commanded IX Corps, as well as in the beginning stages of the Siege of Petersburg. After the Battle of the Crater, Burnside was relieved of command and Parke assumed command of the IX Corps. He led it at the Battle of Globe Tavern, the Battle of Peebles' Farm, and the Battle of Boydton Plank Road. In 1865, while Army of the Potomac commander Maj. Gen. George G. Meade was in a conference, Parke, being senior officer, was acting commander of the army