10th September 1919: Austria signs the Treaty of Saint-Germain at the end of the First World War

The Austrian delegation to Paris was led by the Social Democrat minister Karl Renner who had little choice but to agree to the redrawing of national borders that saw the emergence of several independent nations and the reduction of Austrian power.

6th September 1914: First Battle of the Marne begins with a French counter-offensive against the advancing German army

On the morning of 6 September, the French Sixth Army attacked the German First Army near the River Ourcq while the French Fifth Army and British Expeditionary Force advanced into the gap between the German First and Second Armies. On 9 September, German Chief of Staff Helmuth von Moltke ordered a withdrawal, marking the transition from mobile warfare to the long period of trench warfare that followed.

27th August 1916: Romania enters the First World War by declaring war on Austria-Hungary

By 1916, the Allied governments had promised Romania control of Transylvania and other territories if the Central Powers were defeated. Encouraged by the Brusilov Offensive, which had inflicted heavy losses on Austria-Hungary, Romanian leaders concluded that the moment was favourable for intervention.

13th June 1917: The deadliest air raid on London of the First World War conducted by German Gotha bombers

162 people were killed and over 400 were injured, including at a school in Upper North Street School in Poplar where a bomb struck during school hours.