"Mexicans! The late events of the war and the measures adopted in consequence by our Government make it my duty to address you, in order to lay before you truths of which you are ignorant, because they have been criminally concealed from you. I do not ask you to believe me simply on my word—though he who has not been found false has a claim to be believed—but to judge for yourselves of these truths from facts within the view and scrutiny of you all. Whatever may have been the origin of this war, which the United States was forced to undertake by insurmountable causes, we regard it as an evil. War is ever such to both belligerents, and the reason and justice of the case, if not known on both sides, are in dispute and claimed by each. You have proof of this truth as well as we, for in Mexico, as in the United States, there have existed and do exist two opposite parties, one desiring peace and the other war. Governments have, however, sacred duties to perform from which they can not swerve; and these duties frequently impose, from national considerations, a silence and reserve that displeases at all times the majority of those who, from views purely personal or private, are formed in opposition, to which Governments can pay little attention, expecting the nation to repose in them the confidence due to a magistracy of its own selection—considerations of high policy and of continental American interests precipitated even in spite of circumspection of the Cabinet at Washington. This Cabinet, ardently desiring to terminate all differences with Mexico, spared no effort compatible with honor and dignity. It cherished the most flattering hopes of attaining this end by frank explanations and reasonings addressed to the judgment and prudence of the virtuous and patriotic government of General Herrera. An unexpected misfortune dispelled these hopes and closed every avenue of an honorable adjustment. Your new Government disregarded your national interests, as well as those of continental America, and yielded, moreover, to foreign influences the most opposed to these interests, the most fatal to the future of Mexican liberty and of that republican system which the United States holds it a duty to preserve and protect. Duty, honor, and dignity placed us under the necessity of not losing a season of which the monarchical party was fast taking advantage. As not a moment was to be lost, we acted with a promptness and decision suited to the urgency of the case, in order to avoid a complication of interests which might render our relations more difficult and involved. Again, in the course of civil war, the Government of General Paredes was overthrown. We could not but look upon this as a fortunate event, believing that any other administration representing Mexico would be less deluded, more patriotic, and more prudent, looking to the common good, weighing probabilities, strength, resources, and, above all, the general opinion as to the inevitable results of a national war. We were deceived, and perhaps you Mexicans were also deceived, in judging of the real intentions of General Santa Anna when you recalled and when your Government permitted him to return. Under this state of things the Mexican nation has seen the results lamented by all, and by us most sincerely, for we appreciate as is due the valor and noble decision of those unfortunate men who go to battle ill-conducted, worse cared for, and almost always enforced by violence, deceit, or perfidy. We are witnesses, and we shall not be taxed with partiality as a party interested when we lament with surprise that the heroic behavior of the garrison at Vera Cruz in its valiant defense has been aspersed by the general who has just been routed and put to shameful flight at Buena Vista by a force far inferior to his own. The same general rewarded the insurgents of the capital, promoters of civil war, and heaped outrage upon those who had just acquired for themselves singular distinction by a resistance beyond expectation and of admirable decision. Finally, the bloody events of Cerro Gordo have plainly shown the Mexican nation what it may reasonably expect if it is no longer blind to its real situation—a situation to which it has been brought by some of its generals whom it has most distinguished and in whom it has most confidence. The hardest heart would have been moved to grief in contemplating any battlefield in Mexico a moment after the last struggle. Those generals whom the nation has paid without service rendered for so many years, have, in the day of need, with some honorable exceptions, but served to injure her by their bad example or unskillfulness. The dead and wounded on those battlefields received no marks of military distinction, sharing alike the sad fate which has been the same from Palo Alto to Cerro Gordo; the dead remained unburied and the wounded abandoned to the clemency and charity of the victor. Soldiers who go to battle knowing they have such reward to look for deserve to be classed with the most heroic, for they are stimulated by no hope of glory, nor remembrance, nor a sigh, nor even a grave! Again, contemplate, honorable Mexicans, the lot of peaceful and industrious citizens in all classes of your country. The possessions of the Church menaced and presented as an allurement to revolution and anarchy; the fortunes of rich proprietors pointed out for plunder of armed ruffians; and merchants and the mechanic, the husbandman and the manufacturer, burdened with contributions, excises, monopolies, duties on consumption, surrounded by officers and collectors of these odious internal customs; the man of letters and the legislator, the freeman of knowledge who dares to speak, persecuted without trial by some faction or by the very rulers who abuse their power; and criminals unpunished are set at liberty, as were those of Perote. What, then, Mexicans, is the liberty of which you boast? I do not believe that Mexicans at the present day want the courage to confess errors which do not dishonor them, or to adopt a system of true liberty—one of peace and union with their brethren and neighbors of the North. Neither can I believe the Mexicans ignorant of the infamy of the calumnies put forth by the press in order to excite hostility against us. No, public spirit can not be created or animated by falsehood. We have not profaned your temples, nor abused your women, nor seized your property, as they could have you believe. We say it with pride, and we confirm it by an appeal to your bishops and the curates of Tampico, Tuzpan, Matamoros, Monterey, Vera Cruz, and Jalapa; to all clergy, civil authorities, and inhabitants of all places we have occupied. We adore the same God, and a large portion of our army, as well as of the people of the United States, are Catholics, like yourselves. We punish crime wherever we find it, and reward merit and virtue. The army of the United States respects, and will ever respect, private property of every class, and the property of the Mexican Church. Woe to him who does not where we are! Mexicans, the past is beyond remedy, but the future may yet be controlled. I have repeatedly declared to you that the Government and the people of the United States desire peace, desire your sincere friendship. Abandon, then, state prejudices; cease to be the sport of private ambition, and conduct yourselves like a great American nation. Abandon at once these old colonial habits, and learn to be truly free, truly republican. You may then soon attain prosperity and happiness, of which you possess all the elements; but remember that you are Americans, and that your happiness is not to come from Europe. I desire, in conclusion, to say to you with equal frankness that, were it necessary, an army of one hundred thousand Americans would soon be among you, and that the United States, if forced to terminate by arms their differences with you, would not do it in an uncertain or precarious, or, still less, in a dishonorable manner. It would be an insult to the intelligent people of their country to doubt their knowledge of your power. The system of forming guerrilla parties to annoy us will, I assure you, produce only evil to this country and none to our army, which knows how to protect itself and how to proceed against such cut-throats; and if, so far from calming resentments and passion, you try to irritate, you will but force upon us the hard necessity of retaliation. In that event, you can not blame us for the consequences which will fall upon yourselves. I shall march with this army upon Puebla and Mexico. I do not conceal this from you. From those capitals I may again address you. We desire peace, friendship, and union; it is for you to choose whether you prefer continued hostilities. In either case, be assured, I will keep my word.

Winfield Scott."

Worth's division, now preceded by Harney's cavalry, moved from San Augustin on the main road toward the City of Mexico. These were followed by the other divisions of the army. On this route was situated the pedregal, which is a field of volcanic rock of very uneven surface. It is between the roads leading to the capital from San Augustin and Padierna. A reconnoissance of the pedregal was made by Lieutenants Robert E. Lee and Pierre G.T. Beauregard, who reported that there was a passage for wagons of only a mile, and the remainder might be crossed by infantry, carefully picking the way. The enemy were in position beyond the pedregal with considerable artillery.

General Scott, on the night of the 18th, ordered a movement in the direction of Padierna. Worth was ordered to cover San Antonio, Quitman to hold San Augustin, and Pillow to march over the pedregal, while Twiggs was to cover and support Pillow's movement. On the morning of this movement the Mexican General Blanco was ordered to construct batteries, and General Mejia to take position on the Pelon Cuauhtitlan to command the expected movements of the American army. General Santa Anna wrote from San Antonio through the Minister of War to General Valencia, at San Angel: "The general in chief directs me to say to your Excellency that the enemy having now [August 18th, 3 p.m.] taken up a position on our left in front of San Antonio with a part of his forces, it is clear that to-morrow at the latest he will undertake the attack of this fortification, although it appears there is a movement going on at the same time on our right. His Excellency therefore directs you at daylight to-morrow morning to fall back with your forces to Coyoacan, and send forward your artillery to the fort and the tête-de-pont at Churubusco."

General Valencia declined to obey this order, giving his reason as follows: "I should like much to be able to obey this order, but, in view of present circumstances, my conscience as a military man and my patriotism will not permit me. I believe the national cause will be lost if I should abandon these positions and the road leading from San Augustin through Padierna to these points. To me it is as clear as the light of day that the enemy will undertake his attack, if not to-morrow, the day after, and that he desires to make two attacks at the same time, the one true and the other false, and that, should he find at the commencement of his movements one of the points of attack abandoned, as this, for instance, he will pass by this route with all his forces, and thus be enabled to assail our flank and turn our rear; or, if he prefer it, he may pass on without obstruction to the City of Mexico."

General Valencia, however, ordered a thorough reconnoissance by General Mendoza, an engineer officer, who reported "that Padierna was absolutely indefensible, and that it was believed best to retire for reasons expressed in his note." General Valencia ordered Colonel Barreiro to Zacatepetl to watch and report the movements of the enemy. He further ordered Colonel Mendoza to occupy with his regiment the edge of the pedregal, having in his front a detachment of infantry under Captain Solos, and beyond him a detachment of cavalry. To the left of Padierna was posted the corps of San Luis Potosi, to the right the brigade of Lieutenant-Colonel Cabrera, and on the ridge were the batteries and brigade of General Mejia. The supporting line were three battalions. The reserve at Anzaldo, a mixed company of infantry and cavalry, was the command of General Solos, supported on the right by two regiments of infantry.

Pillow's and Twiggs's divisions were observed by Colonel Barreiro to be moving over the mountain of Zacatepetl and the pedregal. On an open ridge commanding the pedregal General Valencia had planted guns which commanded the pedregal in the direction of San Augustin. On the morning of August 19th General Santa Anna ordered two battalions to move from Churubusco to San Antonio, Pillow's division of the American army having moved out from San Augustin on the road to Padierna, which was to be covered by Twiggs's division. Twiggs moved, following Quitman, and passed beyond San Augustin. General Alvarez closed on his rear. A working party of five hundred men under engineer officers was detailed from Pillow's division to make the road to Padierna practicable for artillery. While work was progressing on this road General Scott notified General Pillow that Valencia was placing heavy guns in position, and ordered that the work be pushed forward as rapidly as possible. Before the road was finished half the distance Twiggs's division passed Pillow's command, and its advance was fired upon by the Mexicans. General Persifor F. Smith ordered the mounted rifle regiment under Major William Wing Loring, aided by a section of Magruder's battery, to drive in the Mexican pickets. Lieutenant George B. McClellan placed the artillery in position, but before it was ready for action it received a fire from the guns on the elevated ridge beyond Padierna. The remainder of Smith's brigade and the other section of Lieutenant John Bankhead Magruder's battery were ordered forward, and the Mexicans were driven back. General Bennet Riley's brigade was ordered to the right, and to pass over the pedregal and take possession in the enemy's rear. General Cadwallader's brigade was ordered to support Riley's movement. General Scott, perceiving that re-enforcements were approaching Valencia from the City of Mexico, ordered a regiment of General Franklin Pierce's brigade to move forward and occupy San Geronimo, and General James Shields with two regiments (New York, and Palmetto, South Carolina) was ordered forward as a support. General Persifor F. Smith now moved to the front across the pedregal, having left detachments as supports to the artillery of Magruder and Callender, which were ordered to open fire on the beginning of General Smith's movement. This movement of General Persifor F. Smith was led and conducted by Lieutenant Gustavus W. Smith. When this force reached the village or town of San Geronimo a large force of the enemy came in sight. Pierce's brigade was at once ordered to the front, and was met by a heavy fire. General Pierce having been disabled, Colonel Robert Ransom, of the Ninth Infantry, was in command of the forces, which were conducted by Lieutenant Isaac Ingles Stevens, and moved to the right and front of Magruder's battery. Ransom, uniting with the detachment left by General Smith, took possession of Padierna, driving the Mexican General Mendoza. Riley's command was the first to pass the pedregal, when it occupied the road on the opposite side with Captain Simon Henry Drum's company of the Fourth Artillery. A detachment of Mexican lancers escorting a train was encountered and captured.

Riley's command continued its advance, when a company of Mexican lancers was met and repulsed by Captain Silas Casey's company. A mounted force, under the Mexican General Frontera, consisting of two regiments, was met and repulsed by the Second Infantry under Captain Charles T. Morris and the Seventh Infantry under Lieutenant-Colonel Joseph Plympton. General Frontera was killed while leading a charge. Riley now withdrew to San Geronimo, which he found occupied by Cadwallader's and Smith's brigades, and a regiment of Pierce's brigade under command of Colonel George Washington Morgan. When General Valencia's advanced forces were driven in by Twiggs's division on the pedregal, Valencia announced (August 19th, 2 p.m.) to General Santa Anna at San Antonio that the enemy were approaching Padierna, the artillery had opened fire, and the battle had begun. General Santa Anna at once, on receipt of this information, sent an officer to Coyoacan with orders to General Perez to move at once to Padierna, and himself with two regiments and five pieces of artillery proceeded to join him. He arrived at Coyoacan just at the time when the command of Perez was moving, and he ordered it to move rapidly.

On the evening of August 19th General P.F. Smith was in San Geronimo with three brigades of infantry, but without cavalry or artillery. His communications with the main army were cut off except through the pedregal. He determined to attack, however, the next morning at daylight, carry the enemy's works, and establish his communications with the main army. His disposition of troops was as follows for the night: Cadwallader's command in the outer edge of the village of San Geronimo, Riley's brigade parallel to it, the Rifles on the right, and the Third Infantry in the churchyard. In the night Captain R.E. Lee arrived, bearing a letter from General Scott asking to be informed of affairs beyond the pedregal. The information sought for was given, and Captain Lee was requested to inform General Scott of General Smith's intention to attack Valencia next morning, and asking that a diversion be made on Valencia's front. General Shields arrived at midnight, and was left to hold the village and cut off the enemy's retreat. In the meantime Colonel Ransom abandoned Padierna, which was soon afterward occupied by General Valencia's forces, but not without stout resistance by the small detachment left there.

At nightfall General Santa Anna fell back to San Angel, but failed to give notice of the movement to General Valencia. Mexican history states that at 9 p.m. Ramero and Del Rio arrived at Valencia's headquarters and delivered an order from Santa Anna to Valencia to retire. General Solos, however, who was present, denies this, saying that the order was qualified by one to spike the guns, destroy the ammunition, and saving only what could be safely transported. General Valencia declined to obey the order. At 2.30 p.m. of August 20th Smith's troops moved to reach Valencia's rear. Riley's brigade and Cadwallader's followed this movement. General Shields with the New York regiment of Colonel Ward B. Burnett and the South Carolina regiment under Colonel Pierce M. Butler remained at the village, to intercept and cut off the enemy's retreat and to prevent re-enforcements from reaching the Mexicans.