 Brown served as a private in Capt.Henry Thompson's First Baltimore Horse Artillery (aka Capt.Thompson's Co of Cavalry, MD Militia) which defended Baltimore from the British attack during the War of 1812 at the Battle of Baltimore with its Bombardment of Fort McHenry, the Battle of North Point in the southeastern reaches of surrounding, then rural Baltimore County on the Patapsco Neck peninsula, and the stand-off at Loudenschlager's Hill/Hampstead Hill (now Patterson Park) in East Baltimore, on September 12-13-14, 1814.