 Nyorai kupfuurira kweiyi ndima - Pakazosvika pakati pama1770, St. Clair akazviona amene kuva muAmerica zvikuru kupfuura munhu weBritain. Muna Ndira 1776, akagamuchira basa muContinental Army semukuru mukuru we3rd Pennsylvania Regiment. Akatanga kuona basa mumazuva ekupedzisira ekurwiswa kweQuebec, kwaakaona basa muHondo yeTrois-Rivières. Akagadzwa kuva brigadier general muna August 1776, uye akatumwa naGeneral George Washington kuti abatsire kuronga mauto eNew Jersey. Akatora chikamu mukuyambuka kwaGeorge Washington kweRwizi rweDelaware husiku hwaDecember 25-26, 1776, pamberi peHondo yeTrenton mangwanani aDecember 26. Vanyori vezvakaitika muupenyu hwevanhu vakawanda vanoti St. Clair ndiye akashandisa zano rakatungamirira kuWashington kutora Princeton, New Jersey, musi waJanuary 3, 1777. St. Clair akasimudzirwa kuva mukuru mukuru muna February 1777. 