. ▁It ▁was ▁the ▁third ▁of ▁four ▁newly ▁activ ated ▁corps ▁of ▁the ▁American ▁Ex ped ition ary ▁Forces , ▁which ▁at ▁that ▁time ▁number ed ▁over ▁ 1 , 0 0 0 , 0 0 0 ▁men ▁across ▁ 2 3 ▁divisions . ▁The ▁corps ▁took ▁command ▁of ▁US ▁forces ▁training ▁with ▁the ▁French ▁Se vent h ▁Army ▁at ▁the ▁same ▁time ▁that ▁IV ▁Corps ▁took ▁command ▁of ▁US ▁forces ▁training ▁with ▁the ▁French ▁E ighth ▁Army . ▁ ▁It ▁served ▁during ▁the ▁Third ▁Battle ▁of ▁the ▁A is ne , ▁the ▁A is ne - O ise ▁Off ensive , ▁the ▁A is ne - Mar ne ▁off ensive , ▁the ▁Me use – Arg onne ▁Off ensive , ▁and ▁under to ok ▁a ▁short ▁time ▁in ▁the ▁def ensive ▁se ctors ▁of ▁Lor raine ▁and ▁Champ agne . ▁It ▁then ▁march ed ▁into ▁Germany ▁from ▁ 1 7 ▁November ▁ 1 9 1 8 ▁to ▁ 2 ▁July ▁ 1 9 1 9 . ▁It ▁was ▁officially ▁dem obil ized ▁on ▁ 1 ▁July ▁ 1 9 1 9 . ▁ ▁IV ▁Corps ▁ ▁IV ▁Corps ▁was ▁first ▁organized ▁on ▁ 1 0 ▁June ▁ 1 9 1 8 , ▁during ▁World ▁War ▁I ▁as ▁part ▁of ▁American ▁Ex ped ition ary ▁Forces ▁at ▁Western ▁Front , ▁as ▁Head quarters ▁IV ▁Army ▁Corps , ▁with ▁its ▁headquarters ▁located ▁in ▁Ne uf ch ate au , ▁France , ▁which ▁also ▁was ▁the ▁headquarters ▁of ▁I ▁Corps . ▁Later , ▁on ▁