Thus flanked and outnumbered by the gathering hosts, the Eleventh Corps, which was most exposed to the enfilading fire of the newly arrived columns, began to waver, then to break, and soon fled in perfect rout. The First Corps was thus compelled to follow, or be annihilated. The two retreating columns met and mingled in more or less confusion in the streets of the town, where they greatly obstructed each other, though the First Corps retained its organization quite unbroken. In passing through the town the Eleventh Corps was especially exposed to the fire of the enemy, who pressed his advantage and captured thousands of prisoners. Our wounded, who, up to this time, had been quartered in Gettysburg, fell into the enemy's hands, and scarcely one-half of our brave boys, who had so recently and proudly passed through the streets to the battle lines, had the privilege of returning, but either lay dead or dying on the well-fought fields, or were captives with a cruel foe. The number of killed and wounded showed how desperately they had fought, and the large number captured was evidence of the overwhelming numbers with which they had contended. General Buford, with his troopers, covered our retreat, showing as bold a front as possible to the enemy, who, it was feared, would follow fiercely, as they were very strong and several hours of daylight yet remained. But doubtless fearing that a trap might be laid for them if they advanced too far, they contented themselves with only a portion of the borough, their main force occupying the hills which form a grand amphitheatre on the north and west. It would be difficult to refrain from saying, that those Rebel forces were prevented from advancing by some mighty unseen hand--the hand of Him who "watches over the destiny of nations." Our feeble and decimated forces took possession of Cemetery Hill, south of the town, and being reenforced by General Sickles' Corps, they began to intrench themselves with earthworks and rifle-pits, to extend their lines to right and left, and to select the best positions for our batteries. This work was continued quite late into the evening, the broad moonlight greatly facilitating the operations.