. ▁E . ▁John ston ▁as ▁it ▁was ▁joined ▁by ▁the ▁Army ▁of ▁the ▁Sh en ando ah ▁on ▁July ▁ 2 0 , ▁ 1 8 6 1 , ▁when ▁command ▁was ▁rel in qu ished ▁to ▁General ▁J . ▁E . ▁John ston . ▁The ▁following ▁day ▁this ▁army ▁fought ▁its ▁first ▁major ▁eng agement ▁in ▁the ▁First ▁Battle ▁of ▁Man ass as . ▁ ▁Command ▁under ▁General ▁J . ▁E . ▁John ston ▁ ▁With ▁the ▁mer ging ▁of ▁the ▁Army ▁of ▁the ▁Sh en ando ah , ▁Gen . ▁Joseph ▁E . ▁John ston ▁took ▁command ▁from ▁July ▁ 2 0 , ▁ 1 8 6 1 , ▁until ▁May ▁ 3 1 , ▁ 1 8 6 2 . ▁ ▁Corps ▁organization ▁under ▁John ston ▁ 1 8 6 1 ▁ ▁First ▁Corps ▁– ▁commanded ▁by ▁General ▁P . G . T . ▁Be a ure g ard ▁ ▁Second ▁Corps ▁– ▁commanded ▁by ▁Maj . ▁Gen . ▁G . ▁W . ▁Smith ▁ ▁Wing ▁organization ▁under ▁John ston ▁ 1 8 6 2 ▁ ▁Left ▁Wing ▁– ▁commanded ▁by ▁Maj . ▁Gen . ▁D . ▁H . ▁Hill ▁ ▁Center ▁Wing ▁– ▁commanded ▁by ▁Maj . ▁Gen . ▁James ▁Long street ▁ ▁Right ▁Wing ▁– ▁commanded ▁by ▁Maj . ▁Gen . ▁John ▁B . ▁Mag r uder ▁ ▁Reserve ▁– ▁commanded ▁by ▁Maj . ▁Gen . ▁G . ▁W . ▁Smith ▁ ▁Under ▁the ▁command ▁of ▁John ston , ▁the ▁Army ▁immediately ▁entered ▁into ▁the ▁First ▁Battle