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The 1918 Spring Offensive or Kaiserschlacht was a series of German attacks along the western front during the First World War which marked the deepest advances by either side since 1914. The German authorities had realised that their only remaining chance of victory was to defeat the Allies before the overwhelming human and material resources of the United States could be deployed. They also had the advantage of nearly 50 divisions freed by the Russian surrender (treaty of Brest-Litovsk).

As we all know these offensives were a Pyrrhic victory. The Germans conquered a big swat of land but failed to force the allies to surrender. Moreover the German losses were enormous. The offensive was quite useless and probably hastened Germany's defeat.

At the time it was quite obvious that Italy was the weakest of the allies. It generally performed poorly compared to its allies and its adversaries even though they only had to face the Austro-Hungarians ( at least until 1917). If the Italians won, their gains were usually quite limited. And then the battle of Caporetto started which lasted from the 24th of October until the 19th of November. That was a truly devastating defeat. The Italians lost over 300.000 soldiers of the 350.000 that fought in the battle while the Germans and Austrians only suffered about 20.000 casualties. In other words: it was a disaster.

The Russians surrendered in march 1918. This freed up many divisions that could be deployed elsewhere. In our TL those were used in Germany's Spring Offensive.

What if those troops were sent to Italy fast for a Spring Offensive there? Would the other allies be able to send in troops fast enough or would the Italians be squashed by the hundreds of thousands of attacking Germans and Austrians? How do the allies react if Italy surrenders? The Germans can use Italy for food and they can attack France from the south now too. That'll worry them. What kind of peace terms do the Italians get? And does Austria-Hungary stick together if there's no battle of the Piave river and no battle of Vittorio Veneto? Would this force the allies to the negotiating table? What kind of peace are the CP's going to get?
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