7:00-8:30pm. Local author Donald Grady Shomette discusses his latest book, Anaconda's Tail: The Civil War on the Potomac Frontier, 1861-1865. With the onset of the American Civil War the Federal Government instituted a massive naval blockade of the Confederacy dubbed "The Anaconda Plan." The northernmost extremity of the blockade of the Potomac River was known as The Anaconda's Tail. Here is the untold story of the desperate struggle for control of that strategic waterway and the conflagration that ensued. Calvert Library Prince Frederick, 850 Costley Way, 410-535-0291 or 301-855-1862. CalvertLibrary.info.