<prompt> Bhala okuqhubekayo kwalesi sigaba - Lapho i - United States ingena eMpini Yezwe I, ngo - April 1917, uMiddleton wabelwa i - 4th Infantry Division, futhi ngokushesha wabona isenzo njengomlawuli webutho ngesikhathi se - Second Battle of the Marne  <response>: . futhi. Ezinyangeni ezintathu kamuva, kulandela izindima ezincane ezisekelayo, iyunithi lakhe lahola ukuhlaselwa ngesikhathi seMeuse-Argonne Offensive, kanti uMiddleton waba ngumkhuzi wombutho. Ngenxa yokusebenza kwakhe enkundleni yempi, ngo-Okthoba 14, 1918 wakhushulelwa esikhundleni sokuba u-colonel, waba, eneminyaka engu-29, isikhulu esincane kunazo zonke kuleso sikhundla e-American Expeditionary Force AEF. Wabuye wathola i-Army Distinguished Service Medal ngomsebenzi wakhe oyisibonelo. Ngemuva kweMpi Yezwe I, uMiddleton wasebenza e-US Army School of Infantry, e-US Army Command and General Staff School, e-US Army War College, futhi waba ngumkhuzi wabafundi e-LSU. Uthathe umhlalaphansi ebuthweni ngo-1937 ukuze abe nguthishanhloko wezokuphatha futhi kamuva abe ngumlawuli futhi asebenze njengephini likamongameli e-LSU. Isikhathi sakhe e-LSU sasigcwele ubunzima, njengoba uMiddleton waba ngomunye wabadlali abakhulu ekusizeni inyuvesi ukuthi ilulame ehlazweni elikhulu lapho cishe isigidi samaRandi sasiphambukile. 