The great memory of Richmond for all time will be of the Civil War, when for three years battles raged around it. The first movement against the city was McClellan's siege in 1862, and the environs show abundant remains of the forts, redoubts and long lines of earthworks by which the Confederate Capital was so gallantly defended. The earliest attack was by Union gunboats in May, 1862, against the batteries defending Drewry's Bluff on James River, seven miles below the town, the defensive works being so strong that little impression was made, but enough was learned to prevent any subsequent naval attack there. McClellan came up the Peninsula between James and York Rivers, approached Richmond from the east, and extended his army around to the north, enveloping it upon a line which was the arc of a circle, from seven miles east to five miles north of the city. The Chickahominy flows through a broad and swampy depression in the table-land north and east of Richmond, bordered by meadows, fens and thickets of underbrush. It thus divided McClellan's investing army, and the first great battle near Richmond was begun by the Confederates, who took advantage of a heavy rain late in May which had swollen the river and swamps. They fell upon the Union left wing on May 31st, and the indecisive battle of Fair Oaks, in which the losses were ten thousand men, was fought southwest of the Chickahominy. General Joseph E. Johnston, the Confederate Commander, was badly wounded, and General Lee succeeded him, continuing in command until the war closed. Extensive cemeteries now mark this battlefield among the swamps. During June the heat and malaria filled McClellan's hospitals with fever cases, and he had to move the greater portion of his army to higher ground north of the Chickahominy, where he erected protective earthworks. These still exist, with the formidable ranges of opposing Confederate works on the south side of the river.