On 22 August 1815 Morillo surrounded the walled city of Cartagena and put it under siege, preventing any supplies from going in until 6 December that year, when the Spanish Royal Army entered the city. With control over Cartagena, Morillo returned to Venezuela to continue the fight against revolutionaries. In June 1820 Morillo, under Royal mandate, ordered that everyone in the colonies obey the Cadiz Constitution and sent delegates to negotiate with Bolivar and his followers. Bolivar and Morillo later met in the Venezuelan town of Santa Ana and signed a six-months' armistice followed by a second one named "War Regularization".