Pedzisa mutsara unotevera: Pana March 4, 1845, Lee akasimudzirwa kuva 1st lieutenant. Boka rake rakatamisirwa kuTexas muna September wegore iroro ndokuiswa pasi paGeneral Zachary Taylor. Muhondo dze
Palo Alto naResaca de la Palma, akatungamira kambani yechirongwa, achishanda pamwe chete na1st Lieutenant James Longstreet. Ainyora nhetembo pamusoro pehondo mbiri idzi.