This is a 3-inch ordinance rifle. It fired projectiles weighing about 10 pounds and had an effective range of just over a mile.
The two-room farmhouse of Lydia Leister, close behind the Federal line on Cemetery Ridge, became Gen. George Meade's headquarters during the battle. On the night after the second day of fighting, he had a war council with his top commanders in the room on the right. The decision they reached was to stay and fight.
This spot on Cemetery Ridge was the farthest that rebels got into the Union line during Pickett's Charge on the 3rd and final day of the battle.