In this conflict General Worth, with three thousand troops, attacked and routed fourteen thousand Mexicans, driving them under the protection of the Castle of Chepultepec. Perceiving the obstinacy with which the field was contested, the commander-in-chief dispatched an order to General Pierce to advance to the support of General Worth’s division. He moved forward with rapidity; and although the battle was won just as he reached the field, he interposed his brigade between Worth and the retreating enemy, and thus drew upon himself the fire of Chepultepec. A shell came streaming from the castle, and, bursting within a few feet of him, startled his horse, which was near plunging over an adjacent precipice. Continuing a long time under fire, Pierce’s brigade was engaged in removing the wounded and the captured ammunition. While thus occupied, he led a portion of his command to repel the attacks of the enemy’s skirmishers. There remained but one other battle,--that of Chepultepec,--which was fought on the 13th of September. On the preceding day (although the injuries and the over-exertion resulting from previous marches and battles had greatly enfeebled him), General Pierce had acted with his brigade. In obedience to orders, it had occupied the field of Molino del Rey. Contrary to expectation, it was found that the enemy’s force had been withdrawn from this position. Pierce remained in the field until noon, when, it being certain that the anticipated attack would not take place before the following day, he returned to the quarters of General Worth, which were near at hand. There he became extremely ill, and was unable to leave his bed for the thirty-six hours next ensuing. In the mean time, the Castle of Chepultepec was stormed by the troops under Generals Pillow and Quitman. Pierce’s brigade behaved itself gallantly, and suffered severely; and that accomplished officer, Colonel Ransom, leading the Ninth Regiment to the attack, was shot through the head, and fell, with many other brave men, in that last battle of the war.