Throughout the 18th century the unused, neglected fortifications deteriorated and were not properly repaired until the 1801 coronation of Alexander I. In one season the moat with bridges and adjacent buildings was replaced with a clean span of paved square. More reconstruction followed in the 19th century. The stretch of Kremlin wall south from Senate Tower was badly damaged in 1812 by the explosion at the Kremlin Arsenal set off by the retreating French troops. Nikolskaya tower lost its gothic crown which was erected in 1807–1808; Arsenalnaya tower developed deep cracks, leading to Joseph Bove proposing in 1813 the outright demolition of the towers to prevent the wall's imminent collapse. Eventually, the main structures of the towers were deemed sound enough to be left in place, and were topped with new tented roofs designed by Bove. Peter's bastions were razed (creating space for nearby Alexander Garden and Theatre Square), The Kremlin wall facing Red Square was rebuilt shallower than before, and acquired its present shape in the 1820s.