Day 1: On 1 July, BG John Buford’s cavalry spotted Confederate troops west of the crossroads town of Gettysburg in Pennsylvania. Looking around he quickly decided that his men needed to protect the high ground east and south of the city lest it fall into Confederate hands. His brigade of dismounted cavalry fought off an entire division of Confederate MG A. P. Hill’s corps before being forced backward to McPherson’s Ridge. It was here that MG John Reynolds and his I Corps of infantry first arrived and strengthened the Union line. As more Union troops arrived so too were more of Hill’s corps fed into the fight until the pressure forced the Yankees back through the town to occupy the heights beyond from Culp’s Hill in the north, along Cemetary Ridge, and ending at Little Round Top to the south.
Day 2: On 2 July 1863 Lee ordered his left and rightmost corps commanders to attack the extreme ends of the extended Union line. Those attacks would fall on Culp’s Hill east of Gettysburg, and Little Round Top to the south. Not realizing MG Dan Sickles had moved his corps well forward from positions on Cemetery Ridge, Longstreet’s corps bungled into Union troops near the Peach Orchard, pushing them back through the Wheatfield and Devil’s Den before reaching the base of Little Round Top. Colonel Vincent’s small brigade managed to hold of successive attacks by Longstreet’s men throughout the day. Especially noteworthy was the determined resistance of the 20th Maine Volunteers which had the dubious honor of occupying the extreme left of the Union position. Their stubborn refusal to give ground left hundreds of Confederate casualties sprawled amongst the rocky terrain and prevented Longstreet from turning the Union left.
Day 3: Lee, having failed to breakthrough on either Union flank reckoned the enemy center must be weak. Meade, coming to the same conclusion, reinforced his center with men from Dan Sickles’s corps, survivors from the previous day’s fighting on the south flank. 12,500 men comprising MG George Pickett’s division, Pettigrew’s division on his left, and Anderson’s division to the right. Pickett’s men aimed their attack at the Angle, a protrusion in the Union line protected by a low stone wall but visible due to a copse of trees within. The distance between Seminary Ridge and the Union lines atop Cemetery Ridge was almost exactly a mile, all of which was well within Union artillery range from the ridge ahead, Cemetery Hill to the north, and Little Round Top to the south. The artillery opened great gaps in the brown-grey lines of men, with rifle fire adding to the rebels’ misery when the range was right. Still, amid all this hot lead, BG Armistead’s brigade managed to penetrate the Angle before being thrown back to Seminary Ridge. Pickett’s division was ruined and Lee was forced to retreat back to Virginia beginning the next day, the 4th of July.