The Catoctin and the South Mountain run on either sides of the valley; and a short distance to the east of the town runs the stream of water called Rock creek. Near the town are two hills, known respectively as Round Top, and Little Round Top, and on the former General Meade posted the extreme left of his line. To the northwest of this position, also on a slight eminence, General Lee had posted his men, forming a circular line of several miles in extent, and almost hemming in the patriot troops. On the morning of the following day a body of cavalry, under General Buford, was sent forward for reconnoitring purposes, and became engaged with the rebel advance immediately. General Reynolds followed, with his entire corps, and plunged into the thickest of the fight at the first sound of battle; the odds, however, were fearful—eight thousand against twenty thousand—and General Reynolds sent an urgent message to General Howard, to send forward reinforcements. But not till one o’clock did the Eleventh corps arrive to the assistance of the hard-pressed men, who still stood their ground like a rock, and fiercely drove back the advancing rebel hosts. General Reynolds riding up and down the line in front of his men, urging them on with look and word, fell a victim to his own dauntless bravery, being shot through the head by a rebel sharpshooter. At last came two divisions of the Eleventh corps, under Schurtz and Barlow. Eager to retrieve their reputation, so tarnished at Chancellorsville, they formed bravely on the right, and stayed the faltering line, for the first time beginning to waver. The remaining division of the Eleventh corps, under General Steinwehr, was sent to occupy a point called Cemetery Hill, on the south side of the town. [Illustration: ALEXANDER H. STEPHENS.] For three hours longer the brave line continued to hold its ground against the ever increasing numbers of the enemy; but human endurance could bear no more, and at last the right wing slowly yielded, and then the whole line fell gradually back, in good order, to the town of Gettysburg. Here they fell a prey to the pursuing rebels, who overtook them in the turnings and twistings of the streets, and in a few minutes one thousand and twenty men became prisoners to the enemy. Now, indeed, the day looked dark for the Union soldiers; but at the very moment that all seemed lost, the artillery of the troops which had been sent to Cemetery Hill blazed forth a most unexpected check to the triumphant rebels. This saved the battle of Gettysburg from being lost to the National arms; the effect of the sudden firing was magical, and night, which now began to darken down around both friend and foe, put an end to the day’s battle.