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Let's say that the Brusilov Offensive was significantly more successful, with much more Central Powers casualties and much less Russian ones. In late July, as the offensive is still ongoing, Austro-Hungarian intelligence notices that the situation is about to get even worse for the Dual Monarchy because Romania is preparing to enter the war on the Entente's side. Emperor Charles, who is already on the throne after Franz Joseph's earlier than OTL death decides to discuss negotiating an end to the war with the German government, but the Germans refuse. As a result, Austria-Hungary begins secret discussions with the Entente about a separate peace. On August 20th, 1916, the ceasefire goes into effect. Under the terms of the agreement, Austria-Hungary must evacuate any Entente territory it occupies, along with BiH, Trentino, and South Transylvania. It must also partially demobilize and withdraw artillery from the borders of Entente states. In return for receiving South Transylvania (and with the hope that they could be awarded more territory at the conclusion of the war) Romania begins an offensive into Bulgaria on the 26th. What happens next?

Does Germany attack Austria-Hungary in retaliation? Do the Italians just quit, or do they send forces to the Western Front to curry favor with France and Britain or join the attack on the Ottomans in hopes of seizing territory from them? If Austria-Hungary isn't attacked by Germany, would the Entente continue to blockade it to prevent supplies from reaching Germany through Austria-Hungary? Does Bulgaria see the writing on the wall and immediately sue for peace? Could the Bulgarians go so far as to switch sides and stab the Ottomans in the back? How long does it take for the Entente to defeat Germany? What would Europe look after the postwar treaties?
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