The Ottoman Empire and German Empire fought each other at Batumi after the arrival of the German Caucasus Expedition whose prime aim was to secure oil supplies. On 3 March 1918, the conflict between the Ottoman Empire and Russia ended with the Treaty of Brest-Litovsk, and on 4 June 1918, the Ottoman Empire signed the Treaty of Batum with Armenia. However, the armed conflicts extended as the Ottoman Empire continued to engage with the Central Caspian Dictatorship, Republic of Mountainous Armenia, and British Empire forces from Dunsterforce until the Armistice of Mudros was signed on 30 October 1918.