Nyorai mberi kweiyi ndima - Pana March 4, 1845, Lee akasimudzirwa kuva 1st lieutenant. Boka rake rakatamisirwa kuTexas muna September wegore iroro ndokuiswa pasi paGeneral Zachary Taylor. Muhondo dzePalo Alto
uye Resaca de la Palma, akatungamirira boka rehurumende, achishumira pamwe chete na1st Lieutenant James Longstreet. Ainyora nhetembo pamusoro pehondo mbiri idzi.