After suffering heavy losses at Brzeziny the remaining members of the regiment had to be gathered into a battalion.

In January 1915 the IIIrd Battalion was reformed and the regiment redeployed at the end of that month to the Carpathians.

After further fighting on the Eastern Front the regiment was sent to the West in April 1916, taking part in trench warfare in the Champagne and on the Yser, and participating in the Battle of the Somme.

From September to November 1916 it deployed again briefly to the Eastern Front before returning to the West and engaging in trench warfare in Lorraine (region).

At the start of the 1918 German Spring Offensive the fusiliers suffered heavy casualties at Beaumetz and subsequently formed itself into 2 battalions of 3 companies each.