Turkey Declares War on Romania
The Romanian Campaign was a campaign in the Balkan theatre of World War I, with Romania and Russia allied against the armies of the Central Powers.
The Romanian government signed a treaty with the Allies on August 17, 1916 and declared war on the Central Powers on August 27. The Romanian Army was quite large, over 500,000 men in 23 divisions. However, it had officers with poor training and equipment; more than half of the army was barely trained. Meanwhile, the German Chief of Staff, General Erich von Falkenhayn correctly reasoned that Romania would side with the Allies and made plans to deal with Romania. Thanks to the earlier conquest of Serbia and the ineffective Allied operations on the Greek border, and having a territorial interest in Dobrogea, the Bulgarian Army and the Ottoman Army were willing to help fight the Romanians.
The Arab Revolt which began in 1916 turned the tide against the Ottomans at the Middle Eastern front, where they initially seemed to have the upper hand during the first two years of the war. When the Armistice of Mudros was signed on October 30, 1918, the only parts of the Arabian peninsula that were still under Ottoman control were Yemen, Asir, the city of Medina, portions of northern Syria and portions of northern Iraq. These territories were handed over to the British forces on January 23, 1919. The Ottomans were also ordered to evacuate the parts of the former Russian Empire in the Caucasus (in present-day Georgia, Armenia and Azerbaijan) which they had gained towards the end of WWI, following Russia's retreat from the war with the Russian Revolution in 1917.
Wikipedia: Romania During World War I
Wikipedia: World War I