When his class was graduated at the end of four years, Jackson stood seventeenth among the seventy. The world was to hear of that class later, for in it were many destined for distinguished honors; among them were Generals A. P. Hill, Pickett, Maury, D. R. Jones, W. D. Smith, and Wilcox of the Confederate Army, and Generals McClellan, Foster, Reno, Stoneman, Couch, and Gibbon of the Federal Army. Jackson himself was no longer an awkward boy, for the training and system at West Point had wrought a change which clung to him through life. He was kind and courteous, but not altogether sociable and had only a few good friends. He was now twenty-two years old, with the brevet rank of second lieutenant of artillery. Our country had already declared war against Mexico, and when his whole class was ordered to the front, Jackson went to New Orleans from whence he sailed to Mexico. General Winfield Scott was there, and Jackson joined his army at Vera Cruz. From this time on, fortune placed him in the centre of the stage. He took part in nearly all the great battles of this war. He was many times mentioned for bravery. At the storming of the Castle of Chapultepec, Captain Magruder recommended him for promotion in the following words: “I beg leave to call the attention of the Major General commanding, to the conduct of Lieutenant Jackson of the First Artillery. If devotion, industry, talent and gallantry are the highest qualities of a soldier, then is he entitled to the distinction which their possession confers.” At once he was brevetted a captain, and a little later made major. It is said “no other officer in the whole army in Mexico was promoted so often for meritorious conduct or made so great a stride in rank.” On September 14, the American Army occupied the city of Mexico. A garrison was finally left to guard the city, and Jackson spent pleasant days in this life of ease among the Mexican people. He learned their language, and took part in some of their pastimes. It was here that religion grew upon him. He began the study of the differing forms of creeds and service taught by soldier chaplains, Mexican priests, and citizen ministers. The Archbishop of Mexico explained to him the system of the Church of Rome, but Jackson was quite undecided when he had listened to them all, and left his selection to a later day. In 1848 the army vacated the city. Major Jackson was sent to Fort Hamilton, on Long Island, where two uneventful years quickly passed. He was next ordered to Fort Meade, near Tampa Bay, Florida, where he stayed for six months. A pleasant change awaited him, for he was elected professor of Natural and Experimental Philosophy and Artillery Tactics at the Virginia Military Institute, where he went in March, 1851.