Ringgold's military career included serving during the War of 1812, and serving as a brigadier general in the Maryland militia.

He served in the Maryland militia during the American Revolution.

Violent street battles occurred in Maryland between the striking workers and the Maryland militia.

After the war, he served with the Maryland militia at the rank of brigadier general.

Nine railroad employees are killed as the Maryland militia attempts to quell the riot.

He also began his service as brigadier general in the Maryland militia.

Their threat effectively resulted in the hesitancy of the local Maryland militia to oppose the invaders.

The farm that the Maryland militia retreated to was probably Chesley's Hill.

Likewise, Smallwood's Maryland militia included a portion of "enlisted men", that is, continentals.

Was commissioned captain, 5th regiment, infantry, Maryland militia, 10 November 1818; resigned.