In contrast, during his lifetime Frémont was widely considered an American hero, with the public nicknaming him "The Pathfinder". His reliable accounts, including published maps, narrations, and scientific documentations of his expeditions, guided American emigrants overland into the West starting in the mid-1840s. Many contemporary Americans believed that Frémont's arrest and court-martial by Kearny during the Mexican–American War were unjustified.
in cONTrAsT, duRing HiS liFEtIme frÉMont wAs widelY coNSiDEred an aMericaN hero, wItH The pUBlIc NIcknAming Him "the pathFinder". HiS reliable accoUnts, incLudINg publiSHed mapS, narratioNs, aNd sciEntiFIC docUMentAtions Of HiS eXPeditiOns, guIDed aMEriCAn eMIgRaNts overLANd into ThE west stArting in The mId-1840s. mAny ContEmpoRAry aMeriCAns BelIeved that frémoNt's ARRest and coUrt-mArTial bY kearNY DuRing THe mexican–ameriCan wAr weRe uNjuStifIed.