Confederate General Henry Heth's division advanced with two brigades forward, commanded by Brig. Gens. James J. Archer and Joseph R. Davis. They proceeded easterly in columns along the Chambersburg Pike. west of town, about 7:30 a.m. on July 1, the two brigades met light resistance from vedettes of Union cavalry, and deployed into line. According to lore, the Union soldier to fire the first shot of the battle was Lt. Marcellus Jones. Lt. Jones later returned to Gettysburg, in 1886 erecting a monument marking the spot where he fired the first shot. Eventually Heth's men encountered dismounted troopers of Col. William Gamble's cavalry brigade. The dismounted troopers resisted stoutly, delaying the Confederate advance by firing their breechloading carbines from behind fences and trees. Still, by 10:20 a.m., the Confederates had pushed the Union cavalrymen east to McPherson Ridge, when the vanguard of the I Corps (Maj. Gen. John F. Reynolds) finally arrived.