The Battle of Hòa Mộc (2 March 1885) was the most fiercely fought action of the Sino-French War (August 1884 – April 1885). At heavy cost, Colonel Giovanninelli's 1st Brigade of the Tonkin Expeditionary Corps defeated forces of the Black Flag and Yunnan Armies blocking the way to the besieged French post of Tuyên Quang.