▁heav iest ▁loss ▁was ▁suffered ▁in ▁the ▁Chan cell ors ville ▁campaign ▁in ▁May , ▁ 1 8 6 3 , ▁when ▁ 2 2 2 ▁of ▁the ▁ 3 7 th ▁were ▁killed , ▁wounded ▁or ▁missing . ▁A ▁report ▁from ▁Major ▁William ▁De L acy ▁rec ount ed ▁the ▁actions ▁of ▁this ▁encounter ▁in ▁detail . ▁The ▁regiment ▁struck ▁t ents ▁the ▁morning ▁of ▁April ▁ 2 8 ▁and ▁march ed ▁about ▁ 6 ▁miles ▁toward ▁the ▁R app ah ann ock ▁River ▁where ▁they ▁enc amp ed . ▁They ▁crossed ▁the ▁river ▁on ▁May ▁ 1 ▁at ▁about ▁ 1 1 am . ▁They ▁def ended ▁a ▁battery ▁on ▁the ▁front ▁and ▁then ▁to ▁connect ▁with ▁the ▁left ▁of ▁General ▁Howard ' s ▁command . ▁A ▁night ▁attack ▁was ▁undert aken ▁at ▁around ▁ 1 1 pm . ▁De L ace y ▁rec ount ed ▁how ▁the ▁regiment ▁" D ro ve ▁some ▁troops ▁from ▁the ▁rif le - p its ▁on ▁our ▁right ." ▁On ▁May ▁ 3 ▁while ▁the ▁brig ade ▁was ▁moving ▁to ▁the ▁rear ▁of ▁the ▁Union ▁lines , ▁a ▁dead ly ▁attack ▁on ▁the ▁front ▁and ▁left ▁fl ank ▁caused ▁confusion ▁and ▁forced ▁the ▁regiment ▁to ▁fall ▁back . ▁? The ▁regiment ▁was ▁later ▁reform ed ▁and ▁fell ▁back . ▁ ▁The ▁three ▁years ▁men ▁were ▁transferred ▁to ▁the ▁ 4 0 th ▁N . ▁Y . ▁on ▁May ▁ 2 9 , ▁ 1 8 6 3 . ▁On ▁June ▁ 2 2 ,