in Tonkin. Several French officers had already commented scathingly on his performance during the Lạng Sơn campaign and at Bang Bo, where he had badly bungled an attack on the Chinese positions. Upon assuming command of the brigade, Herbinger panicked. Despite the evidence that the Chinese had been decisively defeated and were streaming back in disarray towards the Chinese frontier, he convinced himself that they were preparing to encircle Lạng Sơn and cut his supply line. Disregarding the appalled protests of some of his officers, he ordered the 2nd Brigade to abandon Lạng Sơn on the evening of 28 March and retreat to Chũ. The retreat from Lạng Sơn was conducted without loss and with little interference from the Chinese, but Herbinger set an unnecessarily punishing pace and abandoned considerable quantities of food, ammunition and equipment. When the 2nd Brigade eventually rallied at Chũ, its soldiers were exhausted and demoralised. Meanwhile, the Chinese general Pan Dingxin (潘鼎新), informed by sympathisers in Lạng Sơn that the French were in full retreat, promptly turned his battered army around and reoccupied Lạng Sơn on 30 March. The Chinese were in no condition to pursue the French to Chũ, and contented themselves with a limited advance to Đồng Sông. The retreat was seen as a Chinese victory. There was also bad news for the French from the western front. On 23 March, in the Battle of Phu Lam Tao, a force of Chinese regulars and Black Flags surprised and routed a French zouave battalion that had been ordered to scout positions around Hưng Hóa in preparation for Giovanninelli's projected offensive against the Yunnan Army. Collapse of Ferry's government Neither reverse was serious, but in the light of Herbinger's alarming reports Brière de l'Isle believed the situation to be much worse than it was, and sent an extremely pessimistic telegram back to Paris on the evening of 28 March. The political effect of this telegram was momentous. Ferry's immediate reaction was to reinforce the army in Tonkin, and indeed Brière de l'Isle quickly revised his estimate of the situation and advised the government that the front could soon be stabilised. However, his second thoughts came too late. When his first telegram was made public in Paris there was an uproar in the Chamber of Deputies. A motion of no confidence was tabled, and Ferry's government fell on 30 March. The 'Tonkin Affair', as this humiliating