 If the seizure of the cannon was not successful, the government would withdraw from the centre of Paris, build up its forces, and then attack with overwhelming force, as they had done during the uprising of June 1848.The Council accepted his decision, and Vinoy gave orders for the operation to begin the next day.Early in the morning of 18 March, two brigades of soldiers climbed the butte of Montmartre, where the largest collection of cannons, 170 in number, were located.