East Prussia-Poland.
1. First engaged in East Prussia (Angerburg, Gumbinnen, August, 1914, to January, 1915), Jacobi’s Division took part in the operations between Mariampol and Suwalki. Early in March, 1915, it was before Lomza; then in the Ossowiec region on the Bobr. It was at this time that the division became known as the 1st Landwehr Division, and the 33d Landwehr Regiment was attached to it.
2. At the beginning of August the division was in the Kalvariia region, Suwalki. It took part in the summer offensive, but remained in support, never doing any actual fighting.
Courland.
3. After a rest on the Little Berezina, it went to Courland, going into line in the Uxkuell region (October).
1916.
1. The division remained to the south of Riga until the end of July, 1916.
Volhynia.
2. In August it went to Volhynia, where it took over the Borovno sector (on the Stokhod) and held it for more than a year, until about November, 1917. The 6th Landwehr Brigade was taken away and remained in the Mitau region (April, 1916). Since then the division has been composed of only three regiments.