 Kunyange zvazvo akanga ari muUnionist, Smith akaita basa rinokosha munhaurirano dzakatungamirira kusayina Chibvumirano cheAnglo-Irish muna 1921, icho chakatungamirira kukuumbwa kweIrish Free State gore rakatevera racho. Zvakawanda zvechibvumirano chacho zvakanyorwa naSmith. Kutsigira kwake izvi, uye ukama hwake hwakanaka nevatungamiriri vechiIrish vemarudzi Arthur Griffith naMichael Collins, vakatsamwisa vamwe vaimbova vashandi vake veUnionist, kunyanya Sir Edward Carson. Pakusaina Chibvumirano iye akataura kuna Collins, Ndingave ndichangobva kusaina gwaro rangu rorufu rwezvematongerwe enyika, iro Collins rakapindura rakaoma uye nekunyatsoona, Ndangobva kusaina gwaro rangu chairo rorufu. Collins akaurayiwa nevapikisi vechibvumirano chacho mwedzi misere pashure pokusainwa kwacho, mukati meIrish Civil War. 