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394 Fort Tenería, and such parties of Americans as became exposed to range while relieving the guard in the last-named work; but the day passed without any offensive movement on either side. It is surprising that during this inactivity of the enemy, Ampudia, with the forces at his command, did not make more vigorous effort to retain the important heights on the west. But decision and energy were no strong traits of his character. As it was, the success of the Americans raised a panic among his troops; officers and men alike lost heart, and the general himself was infected with the prevailing hopelessness. That night he abandoned Fort Diablo and all his exterior lines of defence, except a few works to the south on the river's bank, and concentrated himself within the interior line around the principal plaza.

Early in the morning of the 23d Taylor was apprised that the enemy had evacuated nearly all his defences in the lower part of the town, and immediately gave directions to Quitman to advance his brigade carefuly and enter the city. Ordering out the remainder of the troops as a reserve under Twiggs, Taylor then visited the abandoned works. A portion of Quitman's brigade had already entered the town, and was successfully pushing forward toward the principal plaza. The 2d regiment of Texas volunteers was now ordered up, and dismounting, coöperated with Quitman's brigade. Advancing cautiously but vigorously from house to house and street to street, the Americans forced their way with little loss to within one square of the principal plaza, driving the Mexicans before them from the barricades and houseroofs in spite of heavy fires of grape and volleys of musketry. But the defences were now of a more formidable nature, and the Mexicans were concentrated in great force behind them. Taylor,