Mount
Lovćen was the key defensive position of the Montenegrin army, who defended it as a citadel with roughly two-thirds of their forces. On 8 August 1914 the Montenegrin High Command commenced operations against the Austro-Hungarian naval base at
Cattaro, the Austro-Hungarian
Kriegsmarine's southernmost base in the
Adriatic Sea. It was just across the border from Mount Lovćen where the Montenegrin army had placed several batteries of artillery, and on the same day, Montenegrin guns commenced firing on Austro-Hungarian fortifications at Cattaro which had been established by the Austro-Hungarian (Croatian) general
Stjepan Sarkotić. The forts of Cattaro and the armoured cruiser
SMS Kaiser Karl VI returned the fire, aided by reconnaissance from navy seaplanes. However, on 13 September, Austrian-Hungarian reinforcements arrived from
Pola, in the form of three active pre-
dreadnought coastal battleships, the
SMS Monarch,
SMS Wien, and
SMS Budapest. They outgunned the Montenegrins, who nevertheless put up a fight for several weeks, with artillery duels almost daily. With the entry of
France into the war, the French realised that the capture of
Cattaro might well be beneficial to their own navy and so they landed an artillery detachment of four 15 cm and four 12 cm naval guns under the command of
Capitaine de frégate Grellier, at
Antivari, on 18–19 September. It took Grellier a month to move his guns inland but eventually his batteries were set up and positioned in fortifications on the south side of Mount Lovćen. On 19 October the French guns opened fire on the Austro-Hungarian positions. The Austro-Hungarians called for reinforcements and on 21 October Admiral
Anton Haus despatched the modern semi-dreadnought battleship
SMS Radetzky. With a broadside of four 30.5 cm guns and four 24 cm guns, the
Radetzky would tip the balance of the battle in the favour of the Austro-Hungarians. Naval seaplanes had been busy taking photographs and mapping accurate positions, and at 16:27, on 22 October all of the battleships opened fire on these position.
Radetzky made a number of direct hits on the guns and fortified positions on the mountain and on 24 October one of the French 12 cm guns was completely knocked out. On 26 October the
Radetzky opened fire before sunrise, catching the French and Montenegrins off guard, and a number of batteries and fortifications were destroyed during what was a heavy bombardment, including another French 12 cm gun. By 10:00, Allied firing from Mount Lovćen had ceased. The following day the
Radetzky repositioned closer to the shore and blasted the Allied positions further. Grellier conceded defeat and pulled out his remaining saveable guns. Likewise, the Montenegrins abandoned their fortifications. By November, the French High Command decided to give up its campaign to neutralize and capture Cattaro, and the
Radetzky returned to Pola on 16 December. On 8 January 1916 a new attack against Montenegrin forces on Mt. Lovćen began with a massive artillery bombardment followed by an Austro-Hungarian army offensive into Montenegro. The Austrian's coastal battleship
Budapest was again used to assist the troops against Lovćen's renewed defences to such good effect that on the 10th, the Austro-Hungarian troops took the
Lovćen Pass and the adjacent heights, where the French guns had previously been. The two heavy bombardments of Mount
Lovćen played a decisive role in breaking the morale of the defenders of the mountain, and by 11 January, Mount Lovćen was in Austrian hands. In the meantime, two independent brigades under Feldmarschalleutnant Braun advanced towards
Nikšić, covering the left flank and threatening to cut off the Montenegrins from the north-east. Braun, however, encountered stiff resistance and advanced only 10 km in the direction of Nikšić. On 13 January 1916, the vanguard of the Austrian army reached the Montenegrin capital
Cetinje. ==Armistice==