Count Thurn leads an army to the…

Count Thurn leads an army to the walls of Vienna itself in 1619.

The Emperor, who had been preoccupied with the Uzkok War, hurries to reform an army to stop the Bohemians and their allies from entirely overwhelming his country.

Count Bucquoy, the commander of the Imperial army, defeats the forces of the Protestant Union led by Count Mansfeld at the Battle of Sablat, on June 10, 1619.

This cuts off Count Thurn's communications with Prague.

The Battle of Sablat also costs the Protestants an important ally—Savoy, long an opponent of Habsburg expansion.

Savoy has already sent considerable sums of money to the Protestants and even sent troops to garrison fortresses in the Rhineland.

The capture of Mansfeld's field chancery reveals the Savoyards' involvement and they are forced to bow out of the war.