Tuhia he whakamāramatanga mō tēnei wāhanga - I whakaurua a Grindlay mai i Boonville i te 8 o Mahuru 1862 mō tētahi wā e toru tau e mahi ana i te Union Army. I uru ia ki te Kamupene D o te 146th New York Infantry hei rangatira. I te marama o Mei me te Pipiri o te tau 1864 i uru te ope ki te pakanga a te Tiamana Ulysses S. Grant i Virginia. I te Pakanga o te Moana i te wiki tuatahi o Mei, he nui te mate o te 146th. I mate te kaihautū o te rēhimene me te tuarua ki te rangatira i te mahi, ka waiho a Grindlay hei rangatira matua. I whakawhiwhia e ia te whakahau o te ope, a ka arahina e ia i roto i te Pakanga o Spotsylvania Court House i muri tonu mai. I whakatairangahia ki te rangatira, i arahi a Grindlay i te 146 mo te toenga o te pakanga, tae atu ki nga pakanga o North Anna, Totopotomoy Creek
, me Cold Harbour.