Ku dhammee weedha soo socota: Monckton wuxuu ka soo laabtay Kariibiyaanka dabayaaqadii 1762. Kadib waxaa loo magacaabay Guddoomiyaha Gobolka New York. Wuxuu qabtay jagadan ilaa 1765, in kasta oo uu ka tagay Waqooyiga Ameerika si wanaagsan 1763 si uu ugu laabto England. Sanadkii 1765 Monckton waxaa loo magacaabay guddoomiyaha Berwick-upon-Tweed. Sanadkii 1770 waxaa loo dalacsiiyay darajada gaashaanle sare. Kadib, Monckton wuxuu xiiseynayay inuu noqdo taliyaha militariga Ingiriiska ee Hindiya inkasta oo uu magacaabista shirkadda East India Company iyo taageerada boqortooyada, haddana looma soo bandhigin jagadaas. Taa badalkeedana waxaa loo soo bandhigay in uu noqdo taliyaha ciidamada ingiriiska ee waqooyiga Ameerika taas oo uu diiday. Sanadkii 1778 wuxuu noqday guddoomiyaha Portsmouth iyo xildhibaan u matalaya magaalada si uu u ilaaliyo danaha Admiralty. Sidoo kale sanadkaas, walaalkiis ka yar, Henry Monckton ayaa la dilay isagoo hogaaminaya grenadiers-ka Dagaalkii Monmouth ee New Jersey intii lagu jiray daadgureynta Philadelphia. Sanadkii xigay, Robert Monckton wuxuu abaabulay difaaca Portsmouth ee ka dhanka ah
Ciidamada badda ee 1779 (inta lagu gudajiray Dagaalkii Xorriyadda Mareykanka). Monckton wuxuu dhintay 21kii Maajo 1782 isagoo 55 jir ah waxaana lagu aasay Kaniisadda St. Mary Abbot, Kensington, London.