s embarking at Algiers for
Tonkin, January 1885 The battle took place three weeks after the end of the
Siege of Tuyên Quang, in the course of a French reconnaissance of positions occupied by troops of
Tang Jingsong's
Yunnan Army and
Liu Yongfu's
Black Flag Army. French accounts of the battle are curiously reticent, suggesting that things had gone badly wrong. In the wake of the relief of Tuyên Quang, General Louis Brière de l'Isle, the general-in-chief of the
Tonkin Expeditionary Corps, drew up plans for a campaign against the Yunnan Army by a column of 5,000 French and Algerian troops, 2,000 Tonkinese auxiliaries and 460 mules and horses. The campaign would be launched from the major French base at
Hưng Hóa.
Chef de bataillon Simon's 1st Battalion, 1st Zouave Regiment, which had only recently arrived in Tonkin, was ordered to make a preliminary reconnaissance of the village of Phu Lam Tao, reported to have been occupied by strong elements of the Yunnan Army. On 23 March 1885, Simon reached Phu Lam Tao and discovered that the village was held by a force of Yunnan regulars and Black Flags ("pirates", as the French called them). Simon ordered his battalion to attack. ==The battle==