The Seven Days Battles began with a Union attack in the minor Battle of Oak Grove on June 25, 1862, but McClellan quickly lost the initiative as Lee began a series of attacks at Beaver Dam Creek (Mechanicsville) on June 26, Gaines's Mill on June 27, the minor actions at Garnett's and Golding's Farm on June 27 and June 28, and the attack on the Union rear guard at Savage's Station on June 29. McClellan's Army of the Potomac continued its retreat toward the safety of Harrison's Landing on the James River.