Germany=November 11, 1918, you have to occupy Berlin for it to surrender
Ottoman Empire=You have to occupy Istanbul in October 1918. The Ottoman Empire will surrender and be divided between France and the United Kingdom.
France=You have to have Paris occupied on November 19, 1919, France has to be in civil war and at war against Germany
Belgium = you have to have its capital occupied, just that, there is no date
Bulgaria=You have to have Sofia captured in September 1918
Austria Hungary collapses on its own