 Complete the following phrase:  The Battle of Riggins Hill September 7, 1862 was a minor engagement in western Tennessee during the American Civil War. A Confederate raiding force under Colonel Thomas Woodward captured Clarksville, Tennessee, threatening Union shipping on the Cumberland River. Several Union regiments led by Colonel William Warren Lowe advanced from nearby Fort Donelson and drove off the Confederates after a struggle lasting less than an hour. The action occurred during the 