 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 neResaca de la Palma, akatungamira kambani yechiremera, achishanda pamwe chete na1st Lieutenant James Longstreet. Ainyora nhetembo pamusoro pehondo mbiri idzi. 