To find more material for these constructions, King Rama I ordered his men to go upstream to the old capital city of Ayutthaya, which was destroyed in 1767 during a war between Burma and Siam. They dismantled structures and removed as many bricks as they could find, while not removing any from the temples. They began by taking materials from the forts and walls of the city. By the end they had completely leveled the old royal palaces. The bricks were ferried down the Chao Phraya by barges, where they were eventually incorporated into the walls of Bangkok and the Grand Palace itself. Most of the initial construction of the Grand Palace during the reign of King Rama I was carried out by conscripted or corvée labour. After the final completion of the ceremonial halls of the palace, the king held a full traditional coronation ceremony in 1785.