 Complete the following phrase:  During the MexicanAmerican War 18461848, Twiggs led a brigade in the Army of Occupation at the battles of Palo Alto and Resaca de la Palma. He was promoted to brigadier general in 1846 and commanded a division at the Battle of Monterrey. He joined Winfield Scotts expedition, commanding its 2nd Division of Regulars. He led the division in all the battles from Veracruz through 