In 1638, the construction of
Santa Margherita fortifications began around Bormla but work stopped soon after due to a lack of funds, and they remained in an unfinished state. In 1669, fears of an Ottoman attack rose after the
fall of Candia, and a new city, the Civitas Cotonera, named after the reigning
Grand Master,
Nicolas Cotoner was designed by the Italian engineer Antonio Maurizio Valperga, who also modified the
Floriana Lines and some other fortifications of the Grand Harbour. In times of siege, the Civitas Cotonera was meant to offer shelter to the 40,000 island's inhabitants and their animals. with a plan of the Cottonera Lines The Civitas Cotonera was called the "most ambitious work of fortification ever undertaken by the Knights of St. John in Malta". Construction of the Civita Cotonera and conversion of the earlier fortifications into the Santa Margherita castle, commenced in 1670 but following an outbreak of the plague, which only helped to put more pressure on the Order's already depleted funds, work was discontinued. In 1680 Grand Master Nicolas Cotoner died and his project was shelved. By this time, the
bastioned enceinte was mostly complete and parts of the
ditch had been excavated, but other crucial parts such as
cavaliers,
ravelins, the
glacis and the
covertway had not yet been built. In the early 18th century, some efforts were made to complete the Cotonera fortifications. Contrary to Grandmaster Cotoner's plan for a castle at the centre of the new city, the Santa Margherita was continued as a line of fortifications.
Gunpowder magazines were built on St. James and St. Clement Bastions, while
Fort San Salvatore was built on St. Salvatore Bastion. The lines were eventually completed in the 1760s, but the ditch was left unfinished while the
outworks and cavaliers were never built. During the
French blockade of 1798–1800, the Cottonera lines were
held by the French. The Maltese insurgents who had rebelled against them built an entrenchment around the Cottonera and the other fortifications in the harbour area. A number of batteries and lookout posts, such as
Tal-Borg Battery and
Windmill Redoubt, were also built in the vicinity. Meanwhile, the French bombarded the Maltese in
Żabbar. The British modified the incomplete Civitas Cotonera in the 19th century with the construction of St. Clement's Retrenchment, which connected the Cotonera with the Santa Margherita fortifications. As part of this project the British also built the Fort Verdala on the same site that Grandmaster Nicolas Cotoner had intended to build his castle. In the 1870s, the Valperga Bastion and St. Paul's Curtain, the St. Paul's Gate and a church dedicated to St. Francis De Paule were demolished to make way for the new road and Ghajn Dwieli tunnel, which formed part of an extension of the
Malta Dockyard. The fortifications were included in the Antiquities List of 1925. Originally Cottonera was a town between Cottonera lines and St Margaret fortifications. When the knights came to Malta and started planning projects, the Cottonera and the three cities were a land named Birmula. It was big enough to divide this land into three cities and a town named Civitas Cotonera. Originally it's not part of Cospicua or Birgu. ==Layout==