| Forts of Serra da Aguieira | |
|---|---|
| Lisbon District, Near Vila Franca de Xira in Portugal | |
 Wall of the Fort of Portela Grande | |
| Coordinates | 38°53′59″N 9°04′19″W / 38.89972°N 9.07194°W |
| Type | Fort |
| Site information | |
| Open to the public | Yes. |
| Condition | Preserved and partly restored. |
| Site history | |
| Built | 1810 |
| Built by | Duke of Wellington |
| Fate | Unused in battle |
The Forts of Serra da Aguieira (Hills of Aguieira) were three forts constructed within 100 metres of each other as part of the second line of defence of the so-called Lines of Torres Vedras, which were constructed by Anglo-Portuguese forces in 1810 in order to protect the Portuguese capital Lisbon from possible invasion by the French during the Peninsular War. The forts are situated in the municipality of Vila Franca de Xira, in the Lisbon District of Portugal. From north to south the three forts are the Fort of Aguieira, the Fort of Portela Grande, and the Fort of Portela Pequena.[1]
- ^ "ROTEIRO Nº4 - A ROTA HISTÓRICA DAS LINHAS DE TORRES" (PDF). Museu Municipal Vila Franca de Xira. Retrieved 31 March 2019.