Ramba uchiverenga ndima iyi - Kubva muna August 1929 kusvika muna July 1931, Hawley akapiwa basa rokuongorora mugero wokuNicaragua. United States Interocean Canal Board yakanga yabvumidza chirongwa chamakore maviri chokunzvera migwagwa yomugero unopfuura neNicaragua kuti ubatanidze Atlantic nePacific Oceans<unk> kuti uve mukuru kupfuura Panama Canal. Boka ravanjinjiniya 320 navashandi vanobetsera rakarongwa kuva chikwata chenguva pfupi chavanjinjiniya - Hawley pakati pavo - vakaongorora migwagwa yakawanda munyika. Pakupedzisira mushumo wokupedzisira wenzvero yacho hauna kuwana nzira yakakodzera chaizvoizvo nokuda kwomugero panguva iyoyo. Pashure pokurwisa umhutu hunotakura marariya nechirwere chechimbwamupengo chaivapo munzanga yomunzvimbomo, Hawley akaiswa kubasa mukati mokudengenyeka kwapasi kwaMarch 1931 muNicaragua
, apo iye neboka rake rezvokurapa vakagadzira nzvimbo yokurapa uye vakapa tarisiro kuvose vakazvipa vamene, vachiita 10 kuvhiya kukuru uye 20 kuvhiya kuduku. Hawley pachake akarapa vakakuvadzwa nokudengenyeka kwemaawa 48 akatevedzana. Nokuda kwebasa rake, akanga ari mumwe wevakuru vakuru vana vebattalion vakapiwa Presidential Medal of Merit yeNicaragua. Pakati pevamwe vakuru vatatu vakagamuchira mubairo uyu vaive mutungamiriri webato, Lieutenant Colonel Daniel I. Sultan, mukuru webato, Major Charles P. Gross, uye Mutungamiriri weA Company, First Lieutenant Leslie R. Groves. Vose gare gare vaizokwira kunzvimbo dzakatanhamara muHondo yeNyika II. Nhengo dzebattalion dzakapiwawo Second Nicaraguan Campaign Medal nokuda kwebasa ravo ikoko. Paiva panguva yake muNicaragua kuti Hawley yakatanga nhamba ukama nevamwe vakuru pamusoro Survey kuti aizomushumira zvakanaka muHondo Yenyika II, apo vazhinji vavo vakafungidzira zvinokosha nzvimbo mukati European Theater pamusoro Operations kana War Department munguva yehondo.