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What if the Austro-Hungarians through a combination of risk taking and luck manage to make their 1916 offensive on the Asiago work and cut off the Italians in North Italy by driving through the Venetian plain to Venice? It would effectively cut off most of the Italian army East of Venice and threaten to collapse their front at the time the Brusilov offensive is going on.
http://www.firstworldwar.com/maps/graphics/maps_42_italy1915-17_(1600).jpg
https://en.wikipedia.org/wiki/Battle_of_Asiago
Let's say as a POD that Brusilov either falls sick or gets injured in early 1916, which delays his plans for his offensive on the Eastern Front, so that comes off later so Conrad gets more time to conduct his offensive before the situation in the East forces a withdrawal of troops from Italy. Add in some early luck during the offensive so that the Austrian troops are able to do better than IOTL at penetrating the Italian lines, which allows them to break out into the Venetian Plain and hit the Italian 5th army, which was a hastily assembled reserve to stop them. Due to the general mishandling of Italian forces the Austrians manage to fight through them and cut off the Isonzo front and trap the Italian 2nd, 3rd, and 4th armies in Northeast Italy, while the Italian 1st and 5th manage to hold a line to the west. About this time the Russians launch the Brussilov offensive (say July 1st) and score their major success.

What happens at this point? The Austrians will either have to withdraw troops to shore up the Eastern Front and probably sacrifice their victory in Italy or the Germans will have to be the ones to render the major aid to the Austrian armies in Galicia, which means cutting off Verdun, as the Somme has started at the same time. Are the Italians able to break the Austrian hold on the Venetian plain and head south or do they try and make peace?
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