Plan of the fort: 1881 drawing from the Tombos dos Fortes da Ilha Terceira
The redoubt was not identified in the early coastal defense plan resulting from the Portuguese succession crisis of 1580, nor in the 1581 defensive map elaborated by Tommaso Benedetto, which was executed by Ciprião de Figueiredo e Vasconcelos, corregador of the Azores.[1]
Similarly, the project was never elaborated by successive military commanders, including Sergeant-Major João António Júdice (1767), Infantry Captain Francisco Xavier Machado (1771-1772), or activities of Manoel Correa Branco (1776). Plans by José Rodrigo de Almeida, also lack any mention of this platform, during the period leading to the Liberal Wars (1818 to 1820), when Captain-General Francisco António de Araújo e Azevedo reinforced coastal defenses, repair and reconstructing several of the forts in the Azores.
The first reference to this fort, then referred to as Biscoitinhos appeared in the 19th century, and may have mistakenly referred to the Redoubt of Poço, then mentioned by Júdice (1767). More than likely it was confused with the Fort of Açougue (Portuguese: Forte do Açougue) ", and identified by Gaspar Frutuoso at the end of the 16th century.
In the context of the Liberal Wars (1828-1834) the Fort of São João was repaired, leading to the 1862 reference by the Baron of Bastos, who reported that the fort was "a simple barbette with an 18-calibre; it has no lodging or magazine".[2]
By 1881, however, it had been abandoned and was in ruins.
By the 20th century, the retaining walls of the redoubt were reinforced and consolidated by the parish council of São Mateus.
Technically, it is classified as a land battery, since it is not enclosed fortification, but a semi-circular base. Although originally equipped with one piece of artillery, protected by a barbette, the masonry structure was without any ancillary buildings.
Bastos, Barão de (1997), "Relação dos fortes, Castellos e outros pontos fortificados que devem ser conservados para defeza permanente", Boletim do Instituto Histórico da Ilha Terceira (in Portuguese), vol. LV, pp. 272–274
Drummond, Francisco Ferreira (1981), Anais da Ilha Terceira (fac-simil. da ed. de 1859) (in Portuguese), Angra do Heroísmo (Azores), Portugal: Secretaria Regional da Educação e Cultura
Faria, Manuel Augusto (14–15 June 1997), "Ilha Terceira – Fortaleza do Atlântico: Forte dos Biscoitinhos", Diário Insular (in Portuguese), Ponta Delgada (Azores), Portugal{{citation}}: CS1 maint: location missing publisher (link)
Júdice, João António (1981), Revista dos Fortes da Terceira (ed. facsimile 1883) (in Portuguese), vol. V, Ponta Delgada (Azores), Portugal: Arquivo dos Açores/University of the Azores, pp. 359–363
Machado, Francisco Xavier (1983), Revista dos fortes e redutos da Ilha Terceira - 1772 (in Portuguese), Angra do Heroísmo (Azores), Portugal: Secretaria Regional da Educação e Assuntos Sociais/Gabinete da Zona Classificada de Angra do Heroísmo
Martins, José Salgado (2007), "Património Edificado da Ilha Terceira: o Passado e o Presente", Atlântida (in Portuguese), vol. LII, p. 18
Mota, Valdemar (1993–1994), "Fortificação da Ilha Terceira", Boletim do Instituto Histórico da Ilha Terceira (in Portuguese), vol. LI–III
Neves, Carlos; Carvalho, Filipe; Matos, Artur Teodoro de (1992), "Documentação sobre as Fortificações dos Açores existentes nos Arquivos de Lisboa – Catálogo", Boletim do Instituto Histórico da Ilha Terceira (in Portuguese), vol. L
Pego, Damião Freire de Bettencourt; Almeida Júnior, António Belo de (1996), "Tombos dos Fortes da Ilha Terceira", Boletim do Instituto Histórico da Ilha Terceira (in Portuguese), vol. LIV, Direcção dos Serviços de Engenharia do Exército
Vieira, Alberto (1987), "Da poliorcética à fortificação nos Açores: introdução ao estudo do sistema defensivo nos Açores nos séculos XVI-XIX", Boletim do Instituto Histórico da Ilha Terceira (in Portuguese), vol. XLV (II ed.)
