Third Balkan War (Loyal Italy)

1914

 * Gavrilo Princip kills Archduke Ferdinand II of Austria.
 * Austria-Hungary declares war on Serbia.
 * The Ottoman Empire and Bulgaria join the war on the side of the Central Powers. Romania and join the Allies.
 * Austria-Hungary captures Belgrade.

1915

 * Romania successfully stops a Bulgarian invasion through the Danube.
 * Bulgaria defeats Romania at the Battle of Constanta.
 * Ottoman forces arrive in Romania through Constanta.
 * British forces land at Gallipoli.
 * Austo-Hungarian forces defeat Serbia at the Battle of Kragujavec, forcing the Serbian government to move its capital again, this time to Nis.
 * Ottoman and Bulgarian forces cross the Danube River in Romania in the hopes of conquering Bucharest.

1916

 * British forces leave Gallipoli.
 * Serbia wins the Battle of Aleksinac, and begins to counterattack against the Austro-Hungarian invasion.
 * Albania declares war on Austria-Hungary.
 * Serbia begins a westward campaign, along with Albania, into Bosnia, hoping to take Sarajevo.
 * France, Britain, and Russia all leave the war.

1917

 * Greece declares war on the Ottoman Empire and Bulgaria.
 * Italy, technically still at war with the countries that declared war on Austria-Hungary, invades Albania, taking Vlora and Durres.
 * Serbia and Albania abandon their Sarajevo campaign.
 * Austria-Hungary, no longer at war with Russia, puts full focus on Serbia, and regains all ground it lost to Serbian counterattacks.

1918

 * Romania loses the Battle of Urziceni, and calls for peace. Romania agrees to a peace treaty in which they give up some land east of the Danube, including the city of Constanta to Bulgaria.
 * Greece agrees to a peace treaty in which Greece gives up some islands, including Crete, to the Ottoman Empire, and otherwise Greece returns to its borders before the Second Balkan War.
 * Italy captures Tirana and Elbassan, and Albania surrenders, though some revolts continue
 * Italy annexes Albania.

1919

 * Bulgaria invades Serbia, and soon takes control of Nis. As the government continues to move, Serbia attempts to negotiate peace with Bulgaria, but fails.
 * Italy, hoping for even more land in the Balkans, invades Serbia from the West.
 * Italy takes Skopje. Bulgaria takes Prishtina. Austria-Hungary takes Novi Pazar.
 * Serbia surrenders, and Italy, Bulgaria, and Austria-Hungary divide it.