Blood in the Streets
On March 13 General Taylor with an army now numbering over 6,500 left Monlova to capture the Mexican city of Monterrey where Cos's army had set up camp and grown to over 7,500. Two weeks after departing Monlova they neared their objective. Taylor's army, with Houston's Texas Division, reached the plain in front of Monterrey at 9 am on the morning of March 29, when they were fired upon by Mexican guns atop the citadel. Taylor ordered the army to camp at Bosque de San Domingo.
Besides the citadel, Mexican strong points within the city included: the "Black Fort", "the Tannery," La Teneria, El Fortin del Rincon del Diablo, and La Purisima bridge and tete-de-pont. West of the city atop Independencia stood Ft. Libertad and the Obispado (bishop's place) with the Activo of Mexico and atop Federacion was a redan and Fort Soldado.
General Zachary Taylor decided to attack western Monterrey using a division under Brigadier General Duncan Lamont Clinch in a giant north and west "hook" movement while simultaneously attacking with his main body from the east. Clinch started at 2 pm on March 30 along with Col. Deaf Smith's Texas Ranger Regiment screening the advance, but they camped for the night three miles from the Saltillo road. By 6 am on March 31, Clinch continued his advance repulsing a Jalisco cavalry charge, and an advance guard consisting of two brigades. By 8:15 am, Worth had severed the Saltillo road from Monterrey and sent 300 infantry and Texans, plus the 7th Infantry ands 2d Brigade to take Federacion and Fort Soldado, which they quickly did. In the mean time Taylor launched a diversion against eastern Monterrey with the 1st and 3d Infantry, which quickly grew into an assault. By 9am, the tannery had been taken and by noon the 1st Tennessee and Mississippi Rifles had taken Fort de La Teneria.
At 3 am on April 1, Clinch sent the Texas Rangers and the 4th and 8th Infantry to take Fort Libertad on Independencia, which they did by day break. They soon took the Obispado and had control of western Monterrey. By then, the Mexicans had abandoned their outer defenses on the east side of Monterrey with it being held by 11 am. By 2 pm General Clinch advanced into the city from the west, burrowing house to house, supported in the late afternoon by a mortar set up in Plaza de la Capella, and were within a block west of the plaza by midnight. The Texan volunteers taught the U.S. regulars new techniques for fighting in the city, techniques that they did not employ on March 29, which had led to staggering casualties. Armed with these new urban warfare skills, the US Army along with Texan, Mississippian, and Tennessee volunteers moved house to house, rooting out Mexican soldiers hiding on rooftops and inside the thick, adobe-walled houses of northern Mexico. By 2 PM Taylor was within two blocks of the plaza when General Cos finally ordered his army's withdrawal.
In the nearly four days of intense fighting both sides armies had suffered a large amount of casualties. The Mexican Army had suffered over 650 casualties, while the Americans had suffered close to 800 casualties of which over 300 were killed or would die from their wounds. The large numbers of casualties sustained in capturing Monterrey would force Taylor to halt his advance to allow his army rest and receive reinforcements. Though more troops were being assembled General Taylor's army was not the only one that needed troops. And the war against Mexico was not the only place that more soldiers were needed.