The "" fought in the Sino-French War (August 1884 to April 1885) and during the period of undeclared hostilities in Tonkin (northern Vietnam) that preceded it. Between June 1883 and April 1886 the Tonkin Expeditionary Corps included several marine infantry battalions and marine artillery batteries. These units saw service in the Sơn Tây Campaign (December 1883), the Bắc Ninh Campaign (March 1884), the Capture of Hưng Hóa (April 1884), the Bắc Lệ ambush (June 1884), the Keelung Campaign (October 1884 to June 1885), the Battle of Yu Oc (November 1884), the Battle of Núi Bop (January 1885), the Lạng Sơn Campaign (February 1885) and the Pescadores Campaign (March 1885). In March 1885 the two marine infantry battalions in Lieutenant-Colonel Ange-Laurent Giovanninelli's 1st Brigade suffered heavy casualties storming the Chinese trenches at the Battle of Hòa Mộc. The French victory at Hòa Mộc relieved the Siege of Tuyên Quang, and was commemorated thereafter in an annual ceremony at Tuyên Quang in which a soldier of the French Foreign Legion (representing the besieged garrison) and a marine infantryman (representing the relief column) solemnly presented arms on the anniversary of the relief of the beleaguered French post.