 He would not rejoin the brigade until shortly before their successful assault on Crampton's Gap, during the lead-up to Battle of Antietam.The VI Corps (ACW) was mostly held in reserve during the battle, though Edward later wrote that his men were convinced they could have finished Lee's army if properly employed.In November 1862, Grubb was promoted to Major, and was transferred to the 23rd New Jersey Volunteer Infantry, a nine-month enlistment unit made up of men from his hometown of Burlington and various parts of Burlington County.