| Fort Carlos III | |
|---|---|
| Écores Rouges, Luisiana (present-day Arkansas Post National Memorial) | |
.jpg) No Surrender by Sidney E. King shows Captain Jacobo du Breuil refusing to accept the note carried by
British hostage Dona de Villars and a partisan demanding surrender of the fort during Colbert's raid. | |
  Fort Carlos III Location in North America | |
| Coordinates | 34°1′5.37″N 91°20′43.43″W / 34.0181583°N 91.3453972°W |
| Height | 13 ft 0 in (3.96 m) |
| Site history | |
| Built | July 11, 1781 |
| Built by |  Spanish Army |
| In use | July 11, 1781 – March 1, 1791 |
| Materials | Wood |
| Fate | Destroyed by river bank erosion; bastions partially reconstructed at Arkansas Post National Memorial |
| Battles/wars | |
| Garrison information | |
| Past commanders |
|
| Garrison | Headquarters, District of Arkansas |
| Occupants | Fixed Infantry Regiment of Louisiana |
Fort Carlos III was a Spanish fort located at the Écores Rouges, Luisiana, within the present-day Arkansas Post National Memorial. Named for King Carlos III, it was located on the left bank of the Arkansas, about 29 miles from the mouth. This wooden palisade fort comprised a stockade, bastions, embrasures, storehouses, barracks, officers' quarters, a powder magazine, cannons, swivel guns, and ordnance stores. The fort served as the headquarters of Spain's district of Arkansas from 1781 until 1791 when it was destroyed by erosion and replaced by Fort San Esteban (later called Fort Madison).