It is situated in the town of Forte da Casa, in the municipality of Vila Franca de Xira, in the Lisbon District.

[1] Following the Treaty of Fontainebleau signed between France and Spain in October 1807, which provided for the invasion and subsequent division of Portuguese territory into three kingdoms, French troops under the command of General Junot entered Portugal, which requested support from the British.

In March 1809, Marshal Soult led a new French expedition that advanced south to the city of Porto before being repulsed by Portuguese-British troops and forced to withdraw.

[3] The Fort of Casa was Number 38 and it was originally named “Da Caza” by the Portuguese Major Brandão de Sousa.

However, Masséna’s troops were repulsed by the first line of defence at Sobral de Monte Agraço and the Fort of Casa never saw action.