Question: What battle took place east of the second-largest drainage system on the North American continent?

Related documents: [0]  [DOC] The Mississippi River is the chief river of the second-largest drainage system on the North American continent, second only to the Hudson Bay drainage system. Flowing entirely in the United States (although its drainage basin reaches into Canada), it rises in northern Minnesota and meanders slowly southwards for 2320 mi to the Mississippi River Delta at the Gulf of Mexico. With its many tributaries, the Mississippi's watershed drains all or parts of 31 U.S. states and 2 Canadian provinces between the Rocky and Appalachian Mountains. The Mississippi ranks as the fourth-longest and fifteenth-largest river in the world by discharge. The river either borders or passes through the states of Minnesota, Wisconsin, Iowa, Illinois, Missouri, Kentucky, Tennessee, Arkansas, Mississippi, and Louisiana. [END] 
[1]  [DOC] The Battle of Munford took place in Munford, Alabama, on Sunday, April 23, 1865, during the raid through the state by 1,500 Union Army cavalrymen under General John T. Croxton, part of the force participating in Wilson's Raid. The Battle of Munford and a minor action at Hendersonville, North Carolina on the same day were the last battles of the American Civil War in the Eastern Theater of the American Civil War (east of the Mississippi River). [END]  
Answer: The Battle of Munford
The Battle of Munford