Royal Montenegrin Army

The Kingdom of Montenegro was the first country to declare war to the Ottoman Empire, attacking the Ottoman city of Novi Pazar to liberate to the christians subjected by the Ottomans. The Montenegrin Army was controlled under the Nicholas and, commanded by the Prince Danilo and Peter, both Nicholas I of Montenegro's sons, and the generals Janko Vukotič and Mitar Martinović. Although Montenegro was the smallest country of the Balkan Peninsula, his military power was incredible:

Montenegro did not have a professional army, being the smallest European army[6] of all the wars it had experienced and apart from its scarce resources, such as guns, machine guns, artillery pieces and cannons, most of its citizens were soldiers or army officers, but good, although it had few men, its casualties were not very serious, losing less than 50% of his men, in the First Balkan War, where 2,836 men were killed, 6,602 wounded and 406 died of disease.

Montenegro gained the eastern part of Kosovo, Metohija, except the area of Prizren, gained by Serbia, but didn't get Shkodër[7] after eight months of siege. Bulgaria accused Serbia of conquest territories non-propose in the treaty, then Bulgaria declared war on Serbia, starting the Second Balkan War. Montenegro will join Serbia, sending 12,800 men below, under the command of Nicholas and Prince Danilo and the general Janko Vukotić. Bulgaria will surrendered in less than a month, only lose 1% of his men, 1,201 casualties; 241 killed and 961 wounded.

Montenegro mobilized 45–50,000 men of his army, with 62 batteries, 14 land cannons and 62 machine guns. Together with 427,597 men of the Royal Serbian Army, they added 465–470,597 men versus 500,000 men of the Austro-Hungarian Army, being defeated in December 1914 with the half of the army lose. Serbia also suffered making 3/4 of the men lose and Montenegro did lose below 1%[8] of the army.