Nyorai kupfuurira kweiyi ndima - Monckton akadzoka achibva kuCaribbean gare gare muna 1762. Akazogadzwa kuva Gavhuna weProvince yeNew York. Akabata chinzvimbo ichi kusvikira muna 1765, kunyange zvazvo akasiya North America zvachose muna 1763 kuti adzokere kuEngland. Muna 1765 Monckton akagadzwa kuva gavhuna weBerwick-upon-Tweed. Muna 1770 akasimudzirwa kuva lieutenant-general. Gare gare, Monckton akatanga kufarira kuva mutungamiriri wemauto eBritain muIndia uye kunyange zvazvo akanga aine zita reEast India Company nerutsigiro rwehumambo, haana kupiwa chinzvimbo chacho. Panzvimbo pezvo, akapiwa basa rokutungamirira uto reBritain muNorth America iro akaramba. Muna 1778 akava gavhuna wePortsmouth uye MP yeguta racho muAdmiralty. Uyewo gore iroro, munun'una wake, Henry Monckton akaurayiwa achitungamirira maGrenadiers paHondo yeMonmouth muNew Jersey panguva yekubviswa kwePhiladelphia. Gore rakatevera racho, Robert Monckton akaronga kuzvidzivirira kwePortsmouth pakurwisa Armada ya1779
(panguva yeHondo yeAmerica yeRusununguko). Monckton akafa musi wa 21 Chivabvu 1782 pazera remakore makumi mashanu nemashanu uye akavigwa muChechi yeSt Mary Abbot, Kensington, London.