The Forts of Enxara dos Cavaleiros were two forts in the Mafra municipality of Portugal constructed in 1810 during the Peninsular War (1807–1814) under the orders of Arthur Wellesley, 1st Duke of Wellington.

They formed part of the first of the three main Lines of Torres Vedras, which were defensive lines designed to protect the Portuguese capital Lisbon from a third invasion by the French or, in the event of defeat, to ensure the safe embarkation of a retreating British Army.

[1] There were 152 forts, batteries, redoubts and other defensive positions developed as part of the three Lines of Torres Vedras north of Lisbon.

Intended to serve as a garrison for up to 270 soldiers, it had six emplacements for cannon and the troops were equipped with Baker rifles and Brown Bess muskets.

Both this and Forte Grande were manned by Spanish soldiers under the command of Pedro Caro Sureda, 3rd Marquis of La Romana.