Under the new municipal government model that was imposed following the Bourbon triumph in 1714, Sants became detached from the city of Barcelona administratively, with the goal of weakening the Catalan capital. The first municipal government of Sants was constituted in 1721. Before the 1713-1714 siege, Sants was formed by 39 houses and had a population of 153 adults. After the devastation caused by the war, the 1715 census recorded only 92 people living in the area.
One of the first battles in the siege of Barcelona took place at the Capuchin Convent of Santa Madrona when, on 8 September 1713, a 3,000-strong Bourbon force attacked the fortified monastery, capturing the site after two days of constant fighting. The response from the besieged forces was a persistent bombardment from Montjuïc Castle, which went on until September 16. The monastery was left in ruins, but in the hands of the assailants, who had advanced a couple of hundred metres. A few weeks later, the Austrian forces turned the tables on their Bourbon foes by launching an attack against their stronghold at Can Navarro. The following January saw the most daring skirmish in the campaign when the Miquelet company, led by Josep Marco i Ferrís, el Penjadet, attacked the Spanish army encampment at Can Safont. This attack achieved its purpose of causing the Bourbon troops to retreat in disarray and, a few days later, on 26 January 1714, commander-in-chief Antonio de Villarroel ordered an offensive against the Bourbon line surrounding Barcelona. After this, there was little fighting in the area. After the surrender of the city, gallows were erected in the centre of the new-constituted municipality of Sants, from which those found guilty of possessing weapons were hanged.