Below is an item found in the War of 1812 Papers of the Department of State:
REPORTS OF WILLIAM LAMBERT, SECRET AGENT. l8l3-
His reports to the Secretary of State concerned movements of the enemy in Maryland between Chesapeake Bay and the Potomac River.
Letter from William Lambert of Lancaster County, Virginia
James Monroe, Secretary of State
"In this letter William Lambert shares information about large ships seen passing up the middle of the Chesapeake Bay as well as an additional force and his fear of an imminent attack in Virginia or Maryland."