These photographs show soldiers of different religious groups standing in front of military priests and taking an oath to king and country. In the first example soldiers stand in front of an orthodox Christian priest. In the second, a Muslim Haji, one who has completed the pilgrimage to Mecca, joins soldiers of Islamic faith.
Most of the Kingdom of Serbia (1882-1918) was orthodox Christian. But there were many other religious groups, one of the largest of which was Muslim.