Thomas served in campaigns against the Florida Seminoles and was chief of staff to Winfield Scott in the Mexican War. He was adjutant general with rank of brigadier general in the Union army but Stanton banished him from Washington in 1863 to organize colored regiments. ALS signed “L. Thomas,” one page, 4.5 x 7, April 17, 1860. Letter of introduction of Mr. Hayes to Colonel John Munroe. In part: “Mr. Hayes, an artist of merit in this city who goes to your distant region to paint the buffaloes…Any attention you may show him will be thankfully acknowledged.” In fine condition, with a bit of scattered trivial toning and intersecting mailing folds. RRAuction COA.