CHAPTER XVI At Chattanooga—The Enemy Fortifies Lookout Mountain and Missionary Ridge—Reorganizing the Army —Removal of General Rosecrans—Punishment of Deserters—Grant at Chattanooga—The Fight on Lookout Mountain—A Brave Color-Bearer —Battle of Missionary Ridge CHAPTER XVII. Ordered to Return to Chattanooga—March to Knoxville —Collecting Subsistence Stores—A Clever Stratagem —A Bridge of Wagons—Looking Out for the Personal Comfort of the Soldiers—A Leave of Absence —Ordered to Washington—Parting with Sheridan's Division CHAPTER XVIII. At Washington—Meeting Secretary Stanton—Interview with President Lincoln—Made Commander of the Cavalry Corps of the Army of the Potomac —Its Officers—General 'Meade's Method of Using Cavalry—Opening of the Campaign—Spottsylvania Court House—A Difference with General Meade —Preparing to Fight Stuart's Cavalry CHAPTER XIX. The Expedition Starts—Destroying Supplies—Opening of the Fight at Yellow Tavern—General Custer's Brilliant Charge—Death of General Stuart—Removing Torpedoes—Excitement in Richmond—A Night March —Enterprising Newsboys—The Effects of Stuart's Defeat and Death—End of the First Expedition —Its Great Success and Beneficial Results CHAPTER XX. General Wilson's Advance Toward Hanover Court House—Crossing the Pamunkey—Engagement of Hawe's Shop—Fight at Matadequin Creek—Capture of Cold Harbor—The Fight to Retain the Place—Movements of General Wilson CHAPTER XXI. The Movement to the James—The Second Expedition —Battle of Trevillian Station—Defeat of General Wade Hampton—Mallory's Crossroads—Suffering of the Wounded—Securing the Trains—General Gregg's Stubborn Fight CHAPTER XXII. General Wilson's Raid—Destroying Railroads —His Discomfiture—Results of his Raid—Remounts —Movement to the North Side of the James —Deceiving Lee—My Isolated Position—Estimate of Hancock—Success of the Cavalry—Their Constant Duties CHAPTER XXIII. General Hunter's Successful March and Subsequent Retreat—General Jubal A. Early Threatens Washington —Chambersburg, Pa., Burned—Selected to Operate Against General Early—The Shenandoah Valley —The Confederate Army CHAPTER XXIV. Moving on General Early—General Grant's Letter of Instructions—Destroying the Resources of the Valley —Reason for the Destruction—Withdrawal to Halltown —Alarm in the North over the Retrograde Movement —Renewing the Advance up the Valley—General Anderson's Attempt to Return to Petersburg —Strength of the Armies