Nathaniel Banks assembled 6,000 soldiers from three brigades in
Napoleon J. T. Dana's XIII Corps. The Confederate forces in the area were commanded by General
Hamilton P. Bee. Bee's forces consisted of a mere 4 companies from the 33rd Texas Cavalry under Colonel James Duff and another 2 companies of 3 month volunteers. All other Confederates along the coast had been called elsewhere in the wake of the Union attack at Sabine Pass. The total Confederate force amounted to roughly 150 men stationed at
Fort Brown. One company of volunteers under Captain Adrian I. Vidal defected, killing a private and wounding another from the 33rd Texas. Banks landed the expedition at the mouth of the Rio Grande on November 2, 1863. Bee dispatched two companies of his cavalry to observe and report on the Union landing. Company A under Captain Richard Taylor arrived at the mouth of the Rio Grande while company under Captain Henry Davis arrived at Point Isabel further north. On November 2 Captain Taylor informed General Bee the Union forces had landed cavalry while Bee made preparatory orders for the evacuation of Brownsville. Colonel
William M. Dye's brigade led the Union advance. After chasing off Taylor's Confederate cavalry, Dye's men entered the Brownsville around 10:00am on November 6, 1863. General Bee quickly ordered the evacuation of the city and abandoned Fort Brown. He personally supervised the burning of what military supplies and cotton he could. Inside the fort was 8,000 pounds of condemned explosives which caused a great explosion much to the terror of the local citizens. The Confederates' destruction spread into the city while the soldiers resorted to looting prompting the local citizens into a degree of opposition. A local resident by the name of General José Maria Cobos was a Mexican general and refugee living in exile due to the recent French invasion. General Cobos received permission from the civilian authorities in Brownsville to organize a force to resist the looters and subdue the fires started by the Confederate evacuation. Around noon General Banks personally arrived in the city and by 4:00pm the remaining Union forces arrived. Colonel Dye was put in command of the post and the Union army encamped in the city, the army barracks at Fort Brown having been destroyed. The Union forces also captured a large supply of cotton left behind by the Confederates. ==Aftermath==