Hood's Division arrived too late for the first day's fighting during the Battle of Gettysburg, but they played a prominent role on the second day, where Robertson led his brigade in a series of hard-hitting, but ultimately unsuccessful, attacks on Little Round Top.
Hoods division ankom for sent til at kunne være med i førstedagens kampe i Slaget ved Gettysburg, men de spillede en fremtrædende rolle på andendagen, da Robertson anførte sin brigade i en række hårdslående, men i sidste ende forgæves, angreb mod Little Round Top.