On the evening of August 12, on orders of General Merritt, General Anderson notified Aguinaldo to forbid the insurgents under his command from entering Manila. On August 13, unaware of the peace protocol signing, U.S. forces assaulted and captured the Spanish positions in Manila. Insurgents made an independent attack of their own, as planned, which promptly led to trouble with the Americans. At 0800 that morning, Aguinaldo received a telegram from General Anderson, sternly warning him not to let his troops enter Manila without the consent of the American commander, who was situated on the south side of the Pasig River. General Anderson's request was ignored, and Aguinaldo's forces crowded forward alongside the American forces until they directly confronted the Spanish troops. Although the Spanish were waving a flag of truce, the insurgents fired on the Spanish forces, provoking return fire. 19 American soldiers were killed, and 103 more were wounded in this action.