During the French Revolutionary Wars, redoubts Number 4 and 5 were rebuilt with stone revetments and a sixth stone redoubt was built at Empacombe in 1807. A supporting barracks was built for the redoubts between 1804 and 1808.
During the French Revolutionary wars, defensive structures Number 4 and 5 were strengthened with stone fortifications, and an additional stone stronghold was built at Empacombe in 1807. A supporting military facility was constructed between 1804 and 1808 to support these defenses.