Лангшон
Not all of the 2nd Brigade was stationed at Lạng Sơn and immediately available for action. The four companies of Servière's 2nd African Battalion were echeloned between Lạng Sơn and Chu, guarding the vital French supply line up to Lạng Sơn and labouring to improve the miserable paths over which the expeditionary corps had advanced in February into a surfaced wagon road.