On the night of 2–3 November 1918 and with the aid of Ahmed Izzet Pasha, the Three Pashas (which include Mehmet Talaat Pasha and Ismail Enver Pasha, the main perpetrators of the Genocide) fled the Ottoman Empire.
On 10 November 1918, taking advantage of the Central Powers' precarious situation, Romania re-entered the war on the side of the Allied forces, with similar objectives to those of 1916. King Ferdinand called for the mobilization of the Romanian army and ordered it to attack by crossing the Carpathian Mountains into Transylvania. The end of World War I that soon followed did not bring an end to fighting for the Romanian army. Its action continued into 1918 and 1919 in the Hungarian–Romanian war.
In other action during the Meuse-Argonne Offensive, Truman's battery provided support for George S. Patton's tank brigade, and fired some of the last shots of the war on November 11, 1918. Battery D did not lose any men while under Truman's command in France.
On 13 November, Károlyi signed an armistice with the Allied nations in Belgrade. It limited the size of the Hungarian army to six infantry and two cavalry divisions. Demarcation lines defining the territory to remain under Hungarian control were made.
Following the 1918 Treaty of Bucharest, the bulk of the Romanian Army was demobilized. Only the 9th and 10th infantry divisions and the 1st and 2nd cavalry divisions were at full strength. However, those units were engaged in the protection of Bessarabia against the Bolshevik Soviet Russians. The 1st, 7th and 8th Vânători divisions, stationed in Moldavia, were the first units to be mobilized. The 8th was sent to Bukovina and the other two were sent to Transylvania. On 13 November, the 7th entered Transylvania at the Prisăcani River in the eastern Carpathians. The 1st then entered Transylvania at Palanca, Bacău.
The lines would apply until definitive borders could be established. Under the terms of the armistice, Serbian and French troops advanced from the south, taking control of the Banat and Croatia. Czechoslovakia took control of Upper Hungary and Carpathian Ruthenia. Romanian forces were permitted to advance to the River Maros (Mureș) . However, on 14 November, Serbia occupied Pécs.
Stresemann then gathered the main body of the old National Liberal Party—including most of its center and right factions—into the German People's Party, with himself as chairman. Most of its support came from the middle class and upper-class Protestants.