During most of the World War I, the town was occupied by the German army. In the spring of 1915, the Germans concentrated Army Group Lauenstein in the area of Tilsit, with three infantry and three cavalry divisions opposing one infantry division and units of border police and Russian volunteers. The Bavarian cavalry division swept through Raseiniai on April 14 en route to Šiauliai. Refugees from Raseiniai appeared in Šiauliai on the morning of April 15 warning of the German advance.