The mgbawa ugwu nke Tseax Cone na 1775 bụ n'etiti Canada kasị njọ ọdachi ndị na-emere onwe ha, na-egbu ihe e mere atụmatụ 2,000 Nisga'a ndị mmadụ na-ebibi ha obodo na Nass River ndagwurugwu nke ugwu British Columbia. Mgbawa ahụ mepụtara a 22.5-kilomita (14.0 mi) lava eruba, na, dị ka Nisga'a akụkọ mgbe, egbochi eruba nke Nass River.
1775 afọ