In 1912, it was joined by a Brotherhood of Sobriety and Chastity. On the holy day of the Transfiguration of Christ (popular name - the Apple Savior), which occurs 6 August (Old Style), the cathedral has traditionally hosted a fruit bazaar. After the 1917 October Revolution the cathedral remained open for worship. In 1918 it became a parish church, and the banners, ordnance, and war trophies kept there were removed and transferred to the Artillery Museum; since 1950 those relics have been part of the Hermitage collection. Also during the 1920s many valuable icons were removed. From 1922 to 1926 (under Antonin Granovsky's Union of Church Regeneration) and from 1935 to the spring of 1944 the cathedral was controlled by the Renovationists; and from 1939, after the Church of the Savior on the Sennaya closed, it was the main Renovationist church in Leningrad. During the Siege of Leningrad an air-raid shelter capable of holding 500 people was constructed in the basement, where first aid was given to the wounded. The façades and interior were restored between 1946 and 1948. Fence Stasov directed construction of a fence around the cathedral in 1832-1833 commemorating the victory in the Russo-Turkish War of 1828-1829, the basis of which was the barrels of cannons taken from Turkish fortresses in Izmail, Varna, Tul'chi, Isakchi, and Silistra, and from the battle at Kulevchi. The engraved coat of arms of the Ottoman Empire is preserved on the barrels and some also bear the names given to the cannons: The Wrath of Allah, Sacred Crescent, Spewing Thunder, I Give Only Death. Trophy cannons shooting 18- and 24-pound balls were set aside as a gift to the cathedral by order of Emperor Nicholas I. The fence consists of 102 bronze cannon barrels, in groups of three, set on thirty-four granite bases. They are set with the muzzles facing downwards to signify they will never again be used in combat. The central barrel of each grouping is topped with a crowned double-headed eagle. The barrel groups are linked by massive decorative chains. The two main gates are decorated with shields with bronze depictions of the medals presented for the war. Also, around the cathedral stand twelve cannons and two Unicorn (long-barreled) cannons, which are the property of the Preobrazhensky regiment. In 1886, architect Ivan Blazheyevich Slupsky designed a chapel built into the fence. In 1916, architect Sergei Osipovich Ovsyannikov planned construction