In August 1898, life in Intramuros, the walled center of Manila, had become unbearable, and the normal population of about 10,000 was now 70,000. Realizing that it was only a matter of time before the city fell and fearing vengeance and looting if the city fell to Filipino revolutionaries, Jáudenes, suggested to Dewey, through the Belgian consul, Édouard André, for the city to be surrendered to the Americans after a short, "mock" battle. Dewey had initially rejected the suggestion because he lacked the troops to block Filipino revolutionary forces, which numbered 40 000, but when Merritt's troops became available, he sent a message to Jáudenes, agreeing to the mock battle. A bloodless mock battle had been planned, but Spanish troops opened fire in a skirmish that left six Americans and forty-nine Spaniards dead after Filipino revolutionaries, thinking that the attack was genuine, joined advancing US troops. Besides the unplanned casualties, the battle went according to plan. The Spanish surrendered the city to the Americans, and it did not fall to the Filipino revolutionaries, who felt betrayed. By the end of September, Aguinaldo's forces had captured over 9,000 Spanish prisoners, who were relieved of their weapons. They were generally free to move around but remained within the control of Aguinaldo. Aguinaldo did not know that on December 10, 1898, the Treaty of Paris had been signed; it transferred the Philippines from Spain to the United States for the sum of $20 million.