positions, they suffered very high casualties (76 dead and 408 wounded). Nevertheless, their costly victory cleared the way to Tuyên Quang. The Yunnan Army and the Black Flags raised the siege and drew off to the west, and the relieving force entered the beleaguered post on 3 March. Brière de l'Isle praised the courage of the hard-pressed garrison in a widely quoted order of the day. 'Today, you enjoy the admiration of the men who have relieved you at such heavy cost. Tomorrow, all France will applaud you!’ The end Bang Bo, Kỳ Lừa and the retreat from Lạng Sơn Before his departure for Tuyên Quang, Brière de l'Isle ordered de Négrier to press on from Lạng Sơn towards the Chinese border and expel the battered remnants of the Guangxi Army from Tonkinese soil. After resupplying the 2nd Brigade with food and ammunition, de Négrier defeated the Guangxi Army at the Battle of Đồng Đăng on 23 February 1885 and cleared it from Tonkinese territory. For good measure, the French crossed briefly into Guangxi province and blew up the 'Gate of China', an elaborate Chinese customs building on the Tonkin-Guangxi border. They were not strong enough to exploit this victory, however, and the 2nd Brigade returned to Lạng Sơn at the end of February. By early March, in the wake of the French victories at Hoà Mộc and Đồng Đăng, the military situation in Tonkin had reached a temporary stalemate. Giovanninelli's 1st Brigade faced Tang Qingsong's Yunnan Army around Hưng Hóa and Tuyên Quang, while de Négrier's 2nd Brigade at Lạng Sơn faced Pan Dingxin's Guangxi Army. Neither Chinese army had any realistic prospect of launching an offensive for several weeks, while the two French brigades that had jointly captured Lạng Sơn in February were not strong enough to inflict a decisive defeat on either Chinese army separately. Meanwhile, the French government was pressuring Brière de l'Isle to send the 2nd Brigade across the border into Guangxi province, in the hope that a threat to Chinese territory would force China to sue for peace. Brière de l'Isle and de Négrier examined the possibility of a campaign to capture the major Chinese military depot at Longzhou (Lung-chou, 龍州), 60 kilometres beyond the border, but on 17 March Brière de l'Isle advised the army ministry in Paris that such an operation was beyond his strength. Substantial French reinforcements reached Tonkin in the