Bigoted and insulting, Mexico was always prompt to manifest her hostility toward this Government, and sought the earliest plausible pretext for declaring war against the United States. This declaration of war by the Mexican government, which bore date in April, 1846, was quickly and spiritedly followed by a manifesto from our Congress at Washington, announcing that a state of war existed between Mexico and the United States. Soon after this counter declaration, the Mexicans crossed the Rio Grande in strong force, headed by the famous generals, Arista and Ampudia. This force, as is well known, was defeated at Palo Alto on the 18th, and at Resaca de la Palma on May 9, 1846, by the troops under command of Major-General Taylor, and repulsed with great slaughter. The whole Union was in a state of intense excitement. General Taylor's recent and glorious victories were the constant theme of universal admiration. The war had actually begun; and that, too, in a manner which demanded immediate action. The United States Congress passed an act about the middle of May, 1846, authorizing President Polk to call into the field 50,000 volunteers designed to operate against Mexico at three distinct points, namely: The southern wing, or the "Army of Occupation," commanded by Major-General Taylor, to penetrate directly into the heart of the country; the column under Brigadier-General Wool, or the "Army of the Center," to operate against the city of Chihuahua; and the expedition under the command of Colonel (afterward Brigadier-General) Kearney, known as the "Army of the West," to direct its march upon the city of Santa Fé. This was the original plan of operations against Mexico, but subsequently the plan was changed. Major-General Scott, with a well-appointed army, was sent to Vera Cruz, General Wool effected a junction with General Taylor at Saltillo, and General Kearney divided his force into three separate commands; the first he led in person to the distant shores of the Pacific. A detachment of nearly eleven hundred Missouri volunteers, under command of Col. A. W. Doniphan, was ordered to make a descent upon the State of Chihuahua, expecting to join General Wool's division at the capital, while the greater part was left as a garrison at Santa Fé, under command of Col. Sterling Price. The greatest eagerness was manifested by the citizens of the United States to engage in the war, to redress our wrongs, to repel an insulting foe, and to vindicate our national honor and the honor of our oft-insulted flag.