a good defensive position", Texas history expert Stephen Hardin believes that "the relative ease of the victory at Concepción instilled in the Texians a reliance on their long rifles and a contempt for their enemies". As the weather turned colder and rations grew smaller, groups of Texians began to leave, most without permission. Morale was boosted on November 18, when the first group of volunteers from the United States, the New Orleans Greys, joined the Texian army. Unlike the majority of the Texian volunteers, the Greys looked like soldiers, with uniforms, well-maintained rifles, adequate ammunition, and some semblance of discipline. After Austin resigned his command to become a commissioner to the United States, soldiers elected Edward Burleson as their new commander. On November 26, Burleson received word that a Mexican pack train of mules and horses, accompanied by 50–100 Mexican soldiers, was within of Béxar. After a near mutiny, Burleson sent Bowie and William H. Jack with cavalry and infantry to intercept the supplies. In the subsequent skirmish, the Mexican forces were forced to retreat to Béxar, leaving their cargo behind. To the disappointment of the Texians, the saddlebags contained only fodder for the horses; for this reason the battle was later known as the Grass Fight. Although the victory briefly uplifted the Texian troops, morale continued to fall as the weather turned colder and the men grew bored. After several proposals to take Béxar by force were voted down by the Texian troops, on December 4 Burleson proposed that the army lift the siege and retreat to Goliad until spring. In a last effort to avoid a retreat, Colonel Ben Milam personally recruited units to participate in an attack. The following morning, Milam and Colonel Frank W. Johnson led several hundred Texians into the city. Over the next four days, Texians fought their way from house to house towards the fortified plazas near the center of town. Cos received 650 reinforcements on December 8, but to his dismay most of them were raw recruits, including many convicts still in chains. Instead of being helpful, the reinforcements were mainly a drain on the dwindling food supplies. Seeing few other options, on December 9, Cos and the bulk of his men withdrew into the Alamo Mission on the outskirts of Béxar. Cos presented a plan for a counterattack; cavalry officers believed that they would be surrounded by Texians and refused their