As General Antonio Lopez de Santa Anna leads his invasion into the rebellious state of Texas, he splits off Brigadier General Jose de Urrea's command to deal with the growing threat facing the river town of Matamoros. Along with sending him to defend the port on the Rio Grande, Santa Anna issues orders for Urrea to invade Texas once Matamoros's threat is neutralized. Luckily for Urrea, the Texian host broke apart due to infighting before it could get off its feet, opening up an avenue of approach for the aggressive Mexican general. With the road north open, Urrea crosses the Rio Grande and sets his army on a collision course with the remnants of the failed Matamoros Expedition. When the Texians get word of Urrea's approach, only one man can stop this new threat marching along the coast, Colonel James W. Fannin Jr. For the next few weeks, both sides will make moves and countermoves to determine the fate of the Texas coast as the rest of the state watches in anticipation of the climatic Siege of the Alamo.