1. Forces under Frémont and Banks were to operate in the Shenandoah valley and prevent a Confederate force attacking Washington from the west. 2. An army under McDowell was to march from Fredericksburg to Richmond. 3. McClellan was to take the main army from Washington by water to Fort Monroe, and then march up the peninsula to Richmond, where McDowell was to join him. [Illustration: The Peninsula Campaign] This peninsula, from which the campaign gets its name, lies between the York and James rivers. Landing at the lower end of it, McClellan was met by General Joseph E. Johnston, who caused a long delay by forcing him to besiege Yorktown. McClellan then advanced up the peninsula, fighting the battle of Williamsburg on the way. At White House Landing he turned toward Richmond, extending his right flank to Hanover Courthouse, where McDowell was expected to join him. But this was not to be, for General T. J. Jackson ("Stonewall" Jackson) rushed down the Shenandoah valley, driving Banks over the Potomac into Maryland, and retreated south before Frémont or McDowell could cut him off; during this campaign he won four desperate battles in thirty-five days. Jackson's success alarmed Washington, and McDowell was held in northern Virginia. McClellan's army, meanwhile, advanced on both sides of the Chickahominy River to within eight miles of Richmond. At Fair Oaks and Seven Pines (May 31) his left flank was almost overwhelmed by Johnston; but the latter was wounded and his troops defeated. Johnston was then succeeded by R. E. Lee, who, joined by Jackson, attacked McClellan at Mechanicsville and Games Mill, and forced him to fall back, fighting for six days (June 26 to July 1, 1862)[1] as he retreated to Harrisons Landing, on the James River. There the army remained till August, when it was recalled to the Potomac. [Footnote 1: The "Seven Days' Battles" are these and one fought June 25.]