Duk da yake da alama suna zaune a gefen fagen yaƙi, sojojin Colorado sun sami kansu a cikin matsayi mai mahimmanci a cikin 1862 bayan mamayewar Confederate na New Mexico Territory da Janar Henry Sibley da rundunar Texans. An yi yakin New Mexico na Sibley a matsayin farkon mamayewa na yankin Colorado zuwa arewa zuwa Fort Laramie, yana yanke hanyoyin samar da kayayyaki tsakanin California da sauran Union.
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