Tuhia he tomokanga mo tenei whitianga - I te 1845, i uru a Bliss ki te mahi hoia a te United States ki te Republic of Texas, i mua i tana whakaurunga. I waenga i te Paenga-whawha 1846 me Noema 1847, i uru ia ki te Pakanga o Mexico, tae atu ki te whawhai ki nga pakanga o Palo Alto
Ko Resaca de la Palma me Buena Vista. I whakawhiwhia ia ki a Major i te marama o Mei 1846, a, i whakawhiwhia ki a Lieutenant Colonel i te marama o Hui-tanguru 1847 mo te mahi toa me te mahi nui.