Tuhia tētahi tohutoro mō tēnei wāhanga - I te tau 1861, i te tīmatanga o te Pakanga ā-Iwi o Amerika, i uru a Twitchell ki te Rōpū I, 4 o Vermont Infantry. Whai muri i te taenga mai o te reimana ki Washington, DC ki te mahi tiaki me te whakaoti whakangungu hei whakarite mo te whawhai, i whakawhiwhia a Twitchell hei kaituhituhi mo tana kamupene. I whakatairangahia ia ki te rangatira, ki te kaitiaki, ki te kaitiaki tuatahi. I uru ia ki te Siege o Yorktown i te tau 1862, a e toru nga wa i whara ia i te Pakanga o Lee's Mill, engari kaore i tino kino. I uru ia ki etahi atu pakanga me te 4th Vermont, tae atu ki te Pakanga o te Teihana Savage
me ngā Pakanga o ngā Rā e whitu.