▁Corps , ▁I ▁Corps ▁was ▁organized ▁and ▁activ ated ▁on ▁ 1 5 – 2 0 ▁January ▁ 1 9 1 8 . ▁I ▁Corps ▁saw ▁its ▁first ▁major ▁action ▁at ▁the ▁Battle ▁of ▁Ch ate au - Th ier ry , ▁while ▁seeing ▁its ▁first ▁off ensive ▁action ▁several ▁days ▁later ▁at ▁the ▁Second ▁Battle ▁of ▁the ▁Mar ne . ▁After ▁serving ▁briefly ▁in ▁the ▁def ensive ▁se ctors ▁of ▁Lor raine ▁and ▁Champ agne , ▁I ▁Corps ▁later ▁served ▁in ▁the ▁Battle ▁of ▁Saint - M ih iel ▁and ▁the ▁Me use – Arg onne ▁Off ensive . ▁It ▁was ▁finally ▁dem obil ized ▁on ▁ 2 5 ▁March ▁ 1 9 1 9 . ▁ ▁II ▁Corps ▁ ▁II ▁Corps ▁was ▁organized ▁in ▁January ▁ 1 9 1 8 ▁with ▁its ▁headquarters ▁being ▁located ▁in ▁Mont re uil , ▁France . ▁It ▁moved ▁to ▁the ▁Western ▁Front ▁in ▁February ▁ 1 9 1 8 , ▁and ▁served ▁in ▁the ▁Second ▁Battle ▁of ▁the ▁Som me ▁and ▁the ▁Third ▁Battle ▁of ▁Albert . ▁It ▁mostly ▁served ▁alongside ▁the ▁New ▁Zealand ▁Division ▁and ▁the ▁Australian ▁Corps . ▁After ▁the ▁Arm ist ice , ▁II ▁Corps ▁was ▁re ass igned ▁to ▁the ▁Third ▁Army ' s ▁control , ▁before ▁being ▁dem obil ized ▁on ▁ 1 ▁February ▁ 1 9 1 9 . ▁ ▁III ▁Corps ▁▁ ▁III ▁Corps ▁was ▁first ▁organized ▁on ▁ 1 6 ▁May ▁ 1 9 1 8 ▁in ▁M uss y - Ser - Se ine , ▁France