Midsummer of 1863 brought a turn in the tide of military affairs. It came none too soon for the safety of the nation. The repeated reverses to the Union arms ending with the shocking disasters at Fredericksburg and Chancellorsville—although slightly relieved by the costly success of Stone River—had seemed to throw the chances of war in favor of the South; and the Union cause was at the crisis of its fate. But now fortune smiled upon the North, and its lost hope and lost ground were regained at Gettysburg and Vicksburg. These great battles are justly regarded as marking the turning-point of the war. It was yet far from finished; there remained nearly two years of desperate fighting, with heroic struggles and terrible sacrifice of life, before the end should come. But from this time the character of the struggle seemed to change. The armies of the South fought, not less desperately, but more on the defensive; and their final overthrow was in all human probability chiefly a question of time.
Emboldened by his success at Chancellorsville in May, General Lee again assumed the offensive, and recrossed the Potomac river into Maryland. Late in June he invaded Pennsylvania, and occupied a position threatening Philadelphia, Baltimore, and Washington. The situation was most critical. If Lee could once more beat the Army of the Potomac, as he had done so many times, these three great cities, and even New York, might be at his mercy. The feeling in Washington is reflected in entries made at the time in Mr. Welles's Diary. "Something of a panic pervades the city," says Mr. Welles. "Singular rumors reach us of Rebel advances into Maryland. It is said they have reached Hagerstown, and some of them have penetrated as far as Chambersburg in Pennsylvania.... The city is full of strange, wild rumors of Rebel raids in the vicinity and of trains seized in sight of the Capital. The War Department is wholly unprepared for an irruption here, and J.E.B. Stuart might have dashed into the city to-day [June 28] with impunity.... I have a panic telegraph from Governor Curtin of Pennsylvania, who is excitable and easily alarmed, entreating that guns and gunners may be sent from the Navy Yard at Philadelphia to Harrisburg without delay.... I went again, at a late hour, to the War Department, but could get no facts or intelligence from the Secretary. All was vague, opaque, thick darkness. I really think Stanton is no better posted than myself, and from what Stanton says am afraid Hooker does not comprehend Lee's intentions nor know how to counteract them. It looks to me as if Lee was putting forth his whole energy and force in one great and desperate struggle which shall be decisive."
Following Lee, the Army of the Potomac, under General Hooker, also recrossed the Potomac, and pur sued the enemy by a somewhat parallel route, but keeping carefully between him and Washington. The occasion was one calling for the best resources of a great military commander; and General Hooker, realizing his unfitness for the responsibility, asked to be relieved of the command. Thus was thrown upon the President the hazardous necessity of changing commanders upon the very eve of a great battle. It was a terrible emergency. Even the stout-hearted Stanton was appalled. He afterward stated that when he received the despatch from Hooker, asking to be relieved, his heart sank within him, and he was more depressed than at any other moment of the war. "I could not say," said Mr. Stanton, "that any other officer knew General Hooker's plans, or the position even of the various divisions of the army. I sent for the President to come at once to the War Office. It was in the evening, but the President soon appeared. I handed him the despatch. As he read it his face became like lead, and I said, 'What shall be done?' He replied instantly, 'Accept his resignation.'"
Immediately an order was sent to Major-General George G. Meade, one of the most efficient of the corps commanders of the Army of the Potomac, appointing him to the chief command. Meade was a quiet, unassuming man, very unlike Hooker. Three days after assuming command, he led his army against the Southern host at Gettysburg, where, after a most bloody and memorable battle of three days' duration (July 1, 2, and 3, 1863), was won the first decisive victory in the history of the gallant Army of the Potomac. Lee retired, with disastrous losses, across the Potomac to Virginia; and Washington and the North breathed free again.
Senator Chandler of Michigan, speaking of the terrible strain on Lincoln during the progress of the battle of Gettysburg, said: "I shall never forget the painful anxiety of those few days when the fate of the nation seemed to hang in the balance; nor the restless solicitude of Mr. Lincoln, as he paced up and down the room, reading despatches, soliloquizing, and often stopping to trace the position of the contending armies on the map which hung on the wall; nor the relief we all felt when the fact was established that victory, though gained at such fearful cost, was indeed on the side of the Union."
Amidst the murk and gloom of those dark days in Washington, when the suspense was breathless and the heart of the nation responded in muffled beats to the dull booming of the cannon of Meade and Lee at Gettysburg, an episode occurred, with Lincoln as the central figure, which reveals perhaps more poignantly than any other in his whole career the depths of feeling in that tender and reverential soul. On Sunday evening, July 4,—the fourth day of that terrible battle, with nothing definite yet known of the result,—the President drove out in a carriage, in company with two daughters of Secretary Stanton, to the line of defenses near Arlington. It was toward sundown; and a brigade of troops were forming in position for an evening parade or review. The commander of the brigade, General Tannatt, recognizing the President and his party, rode up to the carriage and invited them to witness the parade. The President assented. His face was drawn and haggard in its expression of anxiety and sorrow. As it was Sunday evening, some of the regimental bands played familiar religious pieces. The President, hearing them, inquired of General Tannatt if any of his bands could play "Lead Kindly Light." Then in a low voice and with touching accents he repeated, as if to himself, the familiar lines—never more expressive or appropriate than now,—
Lead, kindly light, amid the encircling gloom,
Lead thou me on.
Keep thou my feet; I do not ask to see