German Army General von Murray, who beat the Russians to the brink on the Eastern Front. Mackensen once again served as Commander-in-Chief of the Allied Balkan Army Group, under the command of the Austro-Hungarian 5th and 14th Armies, commanded by the Austro-Hungarian infantry general von Murphy. Covis; The German 12th Army, commanded by German artillery General von Murray. Galwitz; The 1st Bulgarian Army, commanded by Lieutenant General Bogadiedev of the Bulgarian Army.

On October 15, 1915, the Serbian and Montenegro coalition finally learned what it means to destroy the artillery bombardment, the Allied army concentrated 1,700 heavy artillery pieces and 72 mine-throwers to cover the positions of the Serbian-Montenegro coalition forces, and under the two-day artillery bombardment, 90% of the front-line positions of the Serbian and Montenegro armies were destroyed, and the casualties were abnormal.

On 17 October, the Austro-Hungarian army first crossed the river on the ruined northern outskirts of Belgrade, met with only minor resistance, and then the Germans crossed the river and advanced rapidly into the Serbian hinterland.

But in the rubble-strewn and almost ruined city of Belgrade, the remnants of the Serbian troops put up stubborn resistance, and these remnants from almost 27 different units spontaneously organized themselves and engaged in a tragic and arduous house-to-house street battle with the Austro-Hungarian army in the absence of support.

The commander of the Austro-Hungarian 5th Army, General Covis, once asked the commander-in-chief of the army group, Field Marshal Mackensen, to transfer another corps to Belgrade, but Mackensen refused this request, he was trying his best to capture the Serbian and Montenegro field troops, the more troops the better, and did not want to waste too many field infantry resources for a ruined city. However, the heavily mobile heavy artillery units had not yet crossed the river, and Belgrade was within range.

On the morning of the 19th, the Austro-Hungarian army withdrew from the city of Belgrade, and then the carpet shelling began, and 15 hours later, when the Austro-Hungarian army re-entered the city of Belgrade, it was already silent.

The Serbian-Montenegro coalition is fleeing southward, and Prime Minister Bassic's only hope now is to escape as many troops as he can, leaving a little seed for Serbia.

The poor roads of the Balkans constrained the advance of the German-Austrian army, and after Mackensen stretched out several armies like an octopus, only about 150,000 Serbian and Montenegro troops were encircled, and the remaining more than 200,000 Serbian and Montenegro troops rushed towards Thessaloniki.

The Entente could not afford the collapse of the Southwestern Front, and an Anglo-French army landed in Salonique to meet the Serbian and Montenegro forces and stabilize the front.

There was a scene of the British, French, Serbian and Montenew forces confronting the German-Austrian forces at the front line.

The Allied forces with their backs to the sea had sufficient supplies by sea, while the German-Austrian forces were unable to launch an offensive because the logistical supplies and artillery units had not yet arrived.

During the confrontation between the two sides, Serbian and Montenegro Prime Minister Basić took advantage of the extreme weakness of the "Black Shadow" to launch a harsh purge against the "Black Shadow", an ultra-nationalist secret organization in the Serbian army.

However, with the arrival of the German-Austrian heavy artillery forces, and the Bulgarian army joining the Serbian front after the pacification of Macedonia, the Allied German-Austrian and Bulgarian forces had a huge advantage in firepower and troops, and Mackensen began to launch a fierce attack, and the Allied front was crumbling.

The British and French High Command, which had no intention of fighting to the death with the Allies in the Balkans, decided to withdraw its troops, and the Anglo-French forces were withdrawn from the fleet to Egypt. However, due to the lack of ships, the Serbian and Montenegro coalition forces could only retreat to Greece by land, and under the pursuit of the German-Austrian army, the Serbian and Montenegro army again suffered heavy casualties.

Eventually, the Serbian-Montenegro coalition was transported to Corfu by the British and French fleets that had vacated their ships in Greece, and the Serbian and Montenegro troops who were able to reach Corfu were now only 150,000 men, including the wounded. In the Second Serbian Campaign, the Allied forces cleared the entire Balkan continent and achieved the strategic goal of connecting with Turkey, which played a great role in promoting Turkey's front-line operations.

The German-Austrian forces swept across the Balkans, and the Austro-Hungarian army captured Mendenegro and Albania in succession. The Serbian army in Corfu was the best excuse for Austria-Hungary to attack the island, and although the British and French quickly evacuated the 150,000 Serbian troops on the island with ships, the Austro-Hungarian army occupied the island.

Now only Thessaloniki remained, where about 120,000 Allied expeditionary forces were gathered, nominally led by the French general Maurice Brown. Saraj is in full command.

Theoretically, Greece was still a neutral country, but the pro-Entente Prime Minister Venizelos had acquiesced in the Entente's use of Greek territory to support Serbia, using Greek ports and railways to transport supplies to Serbia, and encouraging the Entente to land and occupy Thessaloniki.

King Constantine could not tolerate Venizelos' blatant sabotage of Greek neutrality, and after the German-Austrian army marched into Serbia, the king announced that Venizelos had been relieved of his post and that he had been arrested and imprisoned.

But it was already too late, and now the Greeks could only watch from the sidelines as the German-Austrian army began to besiege Thessaloniki, and fortunately, Lehedon had no intention of invading south.

The Greeks then lost the Macedonian region that they had taken from the Bolgars only three years earlier, and Lehedon did not give it to the Bolgars, and a Macedonian state to be incorporated into the Austro-Hungarian Empire was a good choice, but now was not the time to do so.

Now the Orient Express Road, advocated by the German Kaiser, is finally doing its job, and the Berlin-Baghdad railway connecting West Asia is now unimpeded, and military aid from Germany can be transported to Turkey in large quantities in exchange for much-needed food.

Italy's defeat made the Allies now control almost all of Europe, except for France and the Iberian Peninsula, which greatly enhanced the Allies' ability to sustain war, thus making the Allies' prospects look bleak.

With the fall of Thessaloniki, the most important port in the Aegean Sea, now the British fleet had to withdraw from this sea, and the Austro-Hungarian Navy was now able to control the Aegean Sea.

However, the Austro-Hungarian fleet was currently unable to enter the Black Sea, and the Turks and British had laid a large number of mines in the Dardanelles, and the fleet would not be able to pass through until these hidden dangers were eliminated.

It can take several months to clear the mines of the fairway.

With the onset of winter, the entire front fell silent again.

The year 1915 was a disastrous year for the Allies, who were now left with only three belligerents: Britain, France, and Russia, not counting their allies in distant regions. The Russians had been crippled, and on the French front, the Anglo-French troops cowering in the trenches were like a hedgehog, making it difficult for the Germans to speak.

This year, on the Western Front, the total casualties of the British and French forces were 1.57 million, while the casualties of the German army also reached 690,000, and the battlefield on the Western Front became a huge meat grinder. Germany and France have almost lost blood due to the huge attrition of personnel.

Draining the blood of the Germans and the French, the purpose of the British was achieved.

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