US Presidency
1846

The movement of our Army to the Rio Grande was made by the commanding general under positive orders to abstain from all aggressive acts toward Mexico or Mexican citizens, and to regard the relations between the two countries as peaceful unless Mexico should declare war or commit acts of hostility indicative of a state of war, and these orders he faithfully executed. Whilst occupying his position on the east bank of the Rio Grande, within the limits of Texas, then recently admitted as one of the States of our Union, the commanding general of the Mexican forces, who, in pursuance of the orders of his Government, had collected a large army on the opposite shore of the Rio Grande, crossed the river, invaded our territory, and commenced hostilities by attacking our forces.