6. At the end of July the division again occupied the lines near Mariampol.
Vilna.
7. In the month of August it took part in the offensive upon Vilna. It advanced to Kovno on August 19, to Vilna at the end of September, and reached the area Smorgoni-Soly, where it stopped in October.
8. The division was relieved on October 6. It went back into line about October 24, in the sector of Postawy-Lake Narotch.
Narotch.
1. The 31st Division occupied the vicinity of Lake Narotch until its departure for the Western Front in December, 1917.
2. At the end of March, 1916, it opposed the Russian offensive in the vicinity of this lake; it lost very heavily.
1917.
Belgium.
1. On December 5, 1917, it was relieved from the Russian front, and after a few days rest at Vilna entrained for Belgium on December 16. (Itinerary: Wirballen-Koenigsberg-Elbing-Dirschau-Ramberg (?) Aix la Chapelle-Verviers.) It detrained about the 21st, in the vicinity of Ghent and took up its position at the end of January, 1918 south of the Ypres-Roulers line where it alternated with the 12th Reserve Division.