Although the Edict of Nantes concluded the fighting during Henry IV's reign, the political freedoms it granted to the Huguenots (seen by detractors as "a state within the state") became an increasing source of trouble during the 17th century. The damage done to the Huguenots meant a decline from 10% to 8% of the French population. The decision of King Louis XIII to reintroduce Catholicism in a portion of southwestern France prompted a Huguenot revolt. By the Peace of Montpellier in 1622, the fortified Protestant towns were reduced to two: La Rochelle and Montauban. Another war followed, which concluded with the Siege of La Rochelle, in which royal forces led by Cardinal Richelieu blockaded the city for fourteen months. Under the 1629 Peace of La Rochelle, the "brevets" of the Edict (sections of the treaty that dealt with military and pastoral clauses and were renewable by letters patent) were entirely withdrawn, though Protestants retained their prewar religious freedoms.