At the beginning of the war in the summer of 1914, the general mobilization of Zagreb 13th Corps (including 42nd Home Guard Division) in the 5th Army and the Dalmatian-Herzegovinian 16th Corps under the 6th Army, were sent to Serbia, while Istrian and Međimuje troops were sent to Galicia.
Na početku rata u ljeto 1914. općom mobilizacijom zagrebački XIII. korpus (uključujući 42. dom. diviziju) u sklopu 5. armije i dalmatinsko-hercegovački XVI korpus u sklopu 6. armije upućeni su na Srbiju, dok su istarske i međimurske postrojbe poslane u Galiciju.