 The first serious fighting took place on the afternoon of the 22nd, an artillery duel between regular army batteries on the Quai d'Orsay and the Madeleine, and National Guard batteries on the terrace of the Tuileries Palace.On the same day, the first executions of National Guard soldiers by the regular army inside Paris took place; some sixteen prisoners captured on the Rue du Bac were given a summary hearing, and then shot.On 23 May the next objective of the army was the butte of Montmartre, where the uprising had begun.