Balkan Campaign

Balkan peninsula was the cause of the war. Central Powers, represented by Austria-Hungary, Bulgaria, Germany and the Ottoman Empire on one side and the Allies, represented by France, Montenegro, Russia, Serbia, the United Kingdom, Romania and Greece, fought against each other here.

Background
Balkan peninsula was one of the main cause of the war. Austria Hungary prince was assassinated by Serbian, while Ottoman Empire and Bulgaria hated others who gained their lands in Balkan Wars.

Serbia
Serbia enjoyed early victory in defending in 1914. In 1915, Austria-Hungary-Bulgaria joint forces quickly pushed into the heartland of Serbia, forcing them to retreat to Greece and Albania. Albania was soon captured by Austria-Hungary since Albania was a nation set up by them. Many Serbian fled to sea.

Romania
Romania joined war in 1916. However, the Central Powers forces pushed to their capital within months. Russian now had a longer frontier. Also, due to the failure of Battle of Verdun and Battle of Paris, France couldn't support them.

Greece
Greece joined war in 1916, and their force, with Serbian retreated forces, defeated the attacking Austria-Hungary. Austria-Hungary and Bulgaria then talked with Ottoman Empire, resulted in Ottoman Empire sent 250,000 troops to Greece front, while Austria-Hungary navy support them taking down Cyprus. With new army, the Central Powers immediately launched a new offensive, taking down Epirus and Macedonia.

Greek army retreated into mountains, and defended for a few months. 1917.5.8, Bulgarian troops surprisingly landed Athens, taking control over there at night. War wearness reached new high in Greece and their morale decreased a lot. Guerrilla warfare took place in Northwest Greece, however most Greek troops surrendered.

Cyprus
Cyprus was colonized by Great Britain. The Ottoman Empire army, supported by Austria-Hungary navy, launched a landing in Cyprus. With lack of defenders, Cyprus surrendered before British Royal Navy arrived. British navy then started bombarding Cyprus and Austria-Hungary navy, but lack of army, they couldn't land successfully.

Result
The entire Balkan fell under Central Powers. However, knowing Ottoman Empire sent 250,000 troops to Balkan, The British launched a surprise attack and took Jerusalem down.