According to the official Treaty 8 web page, the terms of the treaty were accepted by the signatories for "reasons of peace and friendship" as part of a partnership.
ɐkˈoːɹdɪŋ tə ðɪ əfˈɪʃəl tɹˈiːɾi ˈeɪt wˈɛb pˈeɪdʒ, ðə tˈɜːmz ʌvðə tɹˈiːɾi wɜːɹ ɐksˈɛptᵻd baɪ ðə sˈɪɡnətˌoːɹiz fɔːɹ "ɹˈiːzənz ʌv pˈiːs ænd fɹˈɛndʃɪp" æz pˈɑːɹt əvə pˈɑːɹtnɚʃˌɪp.