Washington, August 24, 1848. 1 p. Folio on vellum. 18 3/4 x 15 1/2 in. (476 x 394 mm). Document signed by President Polk and countersigned by Secretary of War William Learned Marcy, appointing "Samuel G. Beach First Lieutenant, By Brevet…from the seventeenth day of August...1847 'for gallant and meritorious conduct in the battles of Contreras and Churubusco". With engraved vignettes and paper seal. Docketed at upper left recto. Manuscript contents slightly browned.