On October 12, 1867, Prado entrusted an army of a little over 3,000 men to the president of the cabinet, General
Luis La Puerta. They marched south, with the goal of suffocating the revolution. Prado disembarked in
Islay on October 16 and advanced toward Arequipa, which barricaded itself, following the long republican tradition of resistance owed to its inhabitants. A group of revolutionaries unexpectedly left the city and surprised a pro-government battalion in Congata (a province of the city), a victory that the citizens of Arequipa rejoiced. On November 19, Prado initiated his first attempt to take the city, resulting in a battle which lasted from five in the morning until six in the evening. On the same day, the siege of Arequipa began. The defenders had constructed trenches to block the path, especially in the waterways of San Lázaro and in the Antiquilla (neighborhoods located in the city's historic center). The latter was intended to halt the enemy if they tried to cross the old bridge, belatedly named "Puente Bolognesi", the
Bolognesi Bridge. The government forces used a 68-inch
cannon, with a length of 5 meters, a weight of 5 tonnes, and a radius of 8 kilometers. With every shot, the Arequipans responded with the ringing of bells, uproars, and heavy rifle fire from the parapets. Prado employed another, larger cannon, the Blackley 300, which was transported to Islay with significant difficulty. A group of revolutionaries, at the command of Colonel Andrés Segura, raided the enemy's rearguard and "spiked the cannon", rendering it unusable. They also destroyed the telegraph lines which connected Arequipa with the coast, in order to delay news sent to the headquarters of the government supporters. On December 27, 1867, Prado ordered a second assault. The Arequipans, from behind the
ashlar parapets, defended the city tenaciously. Even women took part in the battle, pouring buckets of boiling water upon the assailants. Some government soldiers surrendered and even defected to the revolutionaries. Prado then decided to retreat to
Lima, with his army reduced to a mere 1,800 of the 3,000 it originally comprised. ==Siege of Chiclayo==