 During the First World War, the battalions of 14th Punjab Regiment served in all the major theatres of war.The 19th Punjabis, while serving in Persia had the unique distinction of being actively engaged against the Bolsheviks in 1918 during the hard-fought actions at Merv, Kaka and Dushak in the Russian Turkestan.The 40th Pathans greatly distinguished themselves in the fighting against the Germans in France and German East Africa, while the rest of the battalions served in the Middle East.