Battle of Williamsburgh--The army not organized--The medical department--Hooker's gallant fight--Hancock's charge--McClellan at Yorktown--Night on the battle-field. Chapter VII. The March up the Peninsula and the Organization of the Sixth Corps. March up the Peninsula--Joy of the contrabands--Cumberland Landing--The Sixth Corps organized--At White House--On the Chickahominy--Fight at Mechanicsville--Battle of Hanover Court House. Chapter VIII. On the Chickahominy. Gaines' Farm--The line of battle--Battle of Seven Pines--Sedgwick and Kearney to the rescue--Hooker's charge--A lost opportunity--Golden's Farm--Ditching--Malaria--Chickahominy fevers--A German regiment-- Stuart's raid. Chapter IX. The Seven Days' Battles. The army united--Plans and counter plans--Battle of Fair Oaks--Lee's plan--The situation--Stonewall Jackson on the flank--Battle of Mechanicsville--Joy in camp--Porter's corps retreats--An astonished army--Battle of Gaines' Farm--Slocum's division at Games' Farm--Retreat to the river--Battle of Golden's Farm--A young hero--A Union victory--Our right exposed--The sick abandoned--A night of sorrow--The grand retreat commenced--Sad scenes at Savage's Station--A meteor railroad train. Chapter X. The Grand Retreat. Lee's army in pursuit--Sumner and Smith at Bay--Battle of Savage's Station--The Vermont Brigade--Sick and wounded abandoned--Retreat to White Oak Swamp--Battle of White Oak Swamp--An astonished division--A night march--A mystery--In sight of the James--Battle of Malvern Hill--Departure of the princes--Gloom and anxiety--Lee's attack--The rebels demoralized. Chapter XI. Harrison's Landing. March to Harrison's Bar--A scene of confusion--A beautiful landscape--Fourth of July in camp--Gloom at the north--Cause of the disasters--Prevalence of disease--Review by the President--A night demonstration by the enemy--Reconnoissance to Malvern Hill--Departure of General Davidson--A retrospect. Chapter XII. Retreat from the Peninsula, and General Pope's Bull Run Campaign. Premonitions of a change of base--The transfer commenced--Marching down the Peninsula--On board transports--A contrast--Arrival at Alexandria--Unaccountable delays--General Pope's campaign--An obstinate general--Causes of Pope's failure. Chapter XIII. The Maryland Campaign. General McClellan restored to command--March through Washington--Leisurely campaigning--Battle of Crampton Pass--Death of Mathison--Battle of South Mountain Pass--Death of Reno--Surrender of Harper's Ferry--March to Antietam. Chapter XIV. The Battle of Antietam.