War and Conflict on the Potomac

Civil War era regional map of Virginia, Maryland and Pennsylvania showing the Potomac River and its tributaries, including important river routes, towns, and features within the watershed.

Library of Congress, Geography and Map Division

The Potomac River as a Strategic Waterway

We often view the Potomac River as the origin of the westward expansion idea, but it has been the central route in a number of other American stories.

In war and conflict, rivers and other waterways have strategic purposes:

• Natural barriers that can impede advancing armies or collapse defensive lines if breached.

• Supply routes to facilitate troop movement, supplies, and communication.

• Controlling access to two different territories and influencing the outcome of military campaigns.

The geographic location of the Potomac River has served as a strategic tool during a number of conflicts and battles throughout history. In the context of war, The Potomac has been a tool in the American Revolution, the War of 1812, and the Civil War.