Liu began an unconventional campaign against the French, with success. Liu fought two further actions against the French in the autumn of 1883, the Battle of Phủ Hoài (15 August 1883) and the Battle of Palan (1 September 1883). The Black Flag Army was mauled in both these battles, but was not seriously damaged as a fighting force. In December 1883, however, Liu Yongfu suffered a major defeat at the hands of Admiral Amédée Courbet in the Sơn Tây Campaign. Despite fighting with fanatical courage in the engagements at Phu Sa on 14 December and Sơn Tây on 16 December, the Black Flags were unable to prevent the French from storming Sơn Tây. Although there were also Chinese and Vietnamese contingents at Son Tay, the Black Flag Army bore the brunt of the fighting, and took very heavy casualties.