Ka cika wannan jumla: Monckton ya dawo daga Caribbean a shekara ta 1762. Daga bisani aka nada shi Gwamnan lardin New York. Ya riƙe wannan matsayi har zuwa 1765, ko da yake ya bar Arewacin Amirka don mai kyau a 1763 don komawa Ingila. A shekara ta 1765 an nada Monckton gwamnan Berwick-upon-Tweed. A shekara ta 1770 an daukaka shi zuwa mukamin Laftanar Janar. Daga baya, Monckton ya zama mai sha'awar zama kwamandan sojan Burtaniya na Indiya kuma duk da cewa ya sami sunan Kamfanin Indiya ta Gabas da kuma goyon bayan sarauta, ba a ba shi wannan matsayin ba. Maimakon haka, an ba shi umurnin rundunar sojojin Birtaniya a Arewacin Amirka wanda ya ƙi. A shekara ta 1778 ya zama gwamnan Portsmouth da MP na garin a cikin sha'awar Admiralty. Hakanan a wannan shekarar, an kashe ƙaramin ɗan'uwansa, Henry Monckton yayin da yake jagorantar grenadiers a yakin Monmouth a New Jersey yayin kwashewar Philadelphia. A shekara mai zuwa, Robert Monckton ya shirya tsaron Portsmouth a kan
Armada na 1779 (a lokacin yakin Amurka na Independence). Monckton ya mutu a ranar 21 ga Mayu 1782 yana da shekaru 55 kuma an binne shi a Cocin St. Mary Abbot, Kensington, London.