Although the Balkan Region is a well-known powder keg of Europe, it is also quite rich in resources. Particularly the petroleum of Romania, at this time, is an essential energy source for the German Empire and Kingdom of Italy's military operations and a critical supply for their offensive efforts.
At this time, the area surrounding the Austrian Empire was amassing a gigantic military force of over 3 million.
Among them, the German Army contributed the most, deploying over 1.5 million soldiers, including 12 tank divisions, 17 artillery divisions, and 2200 aircraft.
These tanks and aircraft were urgently produced during the war preparation phase, with some also being captured from Polish weapons and equipment.
Not to mention, Polish aircraft manufacturing technology was quite decent, and the related blueprints and design data were of great benefit to the Germans.