Odessa and Salonika
In late July, when the weather was warm and Ukraine's fields were full of wheat, the Central Powers thought it was the perfect opportunity to make a charge towards the Black Sea port of Odessa. This way, they could aid the Ottomans in their Caucasian campaign and take out the puppet government the Russians had established in Moldavia at the same time. On July 25th, forces from Austria-Hungary, Romania, and Germany stormed across the Prut River. They quickly captured the Moldavian ad-hoc capitol in Chisinau and began advancing on Russian territory. As Central Powers forces advanced further and further on Odessa, the Russians established a defensive line on the Dneister River. Though it managed to stop the combined onslaught, it couldn't hold out for long. Therefore, Russia asked her allies for help while she was still mobilizing her industry for war.
Great Britain and France, eager to have a place to test out plans they had for a later campaign, agreed. They decided to land armies in the Greek port of Salonika. From there, they could attack towards Macedonia and cover their Serbian allies as they retreated from the Austro-Hungarians into Albania, as well as attack into Bulgaria and cut off the Ottomans from their German allies, and thus most of their industrial base. The attack into Bulgaria would also distract Central Powers forces from Odessa. It was perfect; one action to accomplish three goals. The forces for the Campaign mainly came from the colonies; there were Indochinese soldiers, soldiers from French Africa, Indians, South Africans, Malayans, and, of course, Greeks, Serbs, and Albanians. One force of around 200,000 soldiers, most of them French, was to push into Macedonia as a distraction allowing the Serbs to escape through Albania, where they would be protected by the Royal Navy from prowling Italian and Austro-Hungarian ships. While that was happening, 500,000 soldiers, most of them from the British Empire, would move Northeast, cutting Bulgaria in two. The important Black Sea port of Varna would be the ultimate goal.
The attack was set to commence on August 7th. Its success, or lack thereof, was to decide whether or not the planned offensive in the Dardanelles would go forward or not. It also held in its hands the fate of thousands of innocent Serbian civilians, many of whom had died of disease, malnutrition, or just plain weariness already. Another important thing about Salonika was its affirmation of a new strategy; one that involved taking out the "smaller powers" first, like Bulgaria, before moving on to the bigger ones, allowing the Allies to rest their forces for the planned offensives of 1915. Just as the war had started in the Balkans, a good deal of the war would be fought in the Balkans. The Salonika Offensive saw participation from nearly every major power of the war; Britain, France, Germany, Romania, Bulgaria, Italy, Austria-Hungary, Greece, the Ottomans, and Russia were all involved in some way. Truly, this was a global battle; fitting for a World War such as this.