 Erskine akaendeswa kuAmerica muna 1776 semukuru wemauto eBrigadier pasi paClinton, achiona chiito muNew York mushandirapamwe uye achiraira 7th Brigade paLong Island 27 August 1776. Muna 1777 akanga ari Quartermaster-General kuna Ishe Cornwallis. Erskine anozivikanwa nokuda kwokupa zano Cornwallis panguva yeHondo yeAssunpink Creekinozivikanwawo seKumhanya Kwemakiromita Mashanu kusarega kurwisa Continental Army pausiku hwaJanuary 2, 1777. Mauto eContinental akafamba usiku, achirwa Hondo yePrinceton musi wa 3 Ndira. 