On 12 October 1864, despite Paraguayan ultimatums, Brazil (allied with the Argentine Government under General Bartolom Mitre and the rebellious Uruguayan colorados led by Gen. Venancio Flores) invaded the Republic of Uruguay in order to overthrow the government of that time (which was under the rule of the Blanco Party, an ally of Lpez),[c] thus starting the Paraguayan War.[d]