 As military commander of Mexico City, Scott was held in high esteem by Mexican civil and American authorities alike, primarily owing to the fairness with which he treated Mexican citizens.In November 1847, Trist received orders to return to Washington, and Scott received orders to continue the military campaign against Mexico; Polk had grown frustrated at the slow pace of negotiations.With the support of Scott and Mexican president Manuel de la Peña y Peña, Trist defied his orders and continued the negotiations.