On 5 June 1917, he was sent to the Salonika Front to lead the 11th German Army. Together with his Bulgarian allies, he held the frontline until 15 September 1918, when the allies gained a crushing victory in the Battle of Dobro Pole and Bulgaria was forced to conclude an armistice. Von Steuben and his 11th Army had to withdraw behind the Danube into Hungary.&lt;br&gt;