<prompt> Pedzisa mutsara unotevera: Duncan akaberekwa uye akakurira kumaruwa kuChanceford Township kumaodzanyemba kwakadziva kumabvazuva kweYork County, Pennsylvania, iyo inoganhurana neRwizi rukuru rweSusquehanna. Akagadzwa kuUnited States Military Academy musi waJuly 1, 1845, uye akapedza kudzidza kuWest Point muna June 1849. Mudzidzi akanaka, akaiswa pachinzvimbo chechishanu mukirasi yevadzidzi 43. Nemugariro wake wedzidzo yakakwirira, akasimudzirwa kuva lieutenant wechipiri uye akagadzwa kuChipiri US Artillery muna July wegore iroro. Pasina nguva refu, musi waOctober 31, akapiwa chinzvimbo chakakwana chechipiri lieutenant uye akatumirwa kuTatu Artillery. Akaona chiito chake chokutanga chokurwa achishumira mu  <response>: Hondo dzokuFlorida dzinorwisana nemaIndia echiSeminole. 