Cotton was the Confederacy's lifeblood. Its sale funded arms, critical supplies and paid for the government, but the union blockade kept it from foreign markets. Matamoros, Mexico became the South's "backdoor." Cotton caravans had to cross the dangerous Texas plains--fraught with bandits, Comanche, lack of water, and other deadly challenges--then, sell the cotton in a market teaming with fraudsters and scalawags . . .