Mazarin recommended to the Queen that she listen to the "parlement" and modify her decrees, but she was furious at their opposition. She waited until the right moment to strike back. The occasion she chose was the celebration of a major victory of the French Army over the Spanish at the Battle of Lens in Belgium on 26 August 1648. On the day that a special mass was held at the Cathedral of Notre Dame de Paris to celebrate the victory, she gave orders to the Captain of her guards to arrest the leaders of the "parlement", including the popular Pierre Broussel. News of the arrest quickly spread in Paris, and crowds came out into the street to protest and to build barricades. That evening Mazarin wrote in his journal, "the "parlement" has performed the functions of the King, and the people have deferred to it entirely."