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On 23 July 1914 the Austro-Hungarian government issued Serbia with an ultimatum containing concrete demands in order to prevent an escalation. When the ultimatum is examined closely, it becomes clear that Vienna was concerned with making the demands as unacceptable as possible. -
Gavrilo Principassassinates Franz Ferdinand, 1914 The assassination of Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, and his wife Sophie in Sarajevo (the capital of the Austro-Hungarian province of Bosnia-Herzegovina) on 28 June 1914 eventually led to the outbreak of the First World War. -
Telegram of Austria-Hungary`s declaration of war on Serbia on 28th July 1914 marked the beginning of the First World War – one of the world's most tragic conflicts in the history of human race and initiated the era of unprecedented suffering. -
On 31 July, Germany sent an ultimatum to Russia demanding it Demobilise. The next day, this ultimatum expired without a reply. Germany declared war on Russia and ordered its own general Mobilisation. France knew that it faced German invasion, but was clear that it must stand or fall with Russia. -
After weeks of speculation and mounting tension, Great Britain declared war on Germany on 4 August 1914. -
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On 31 October 1914, the Ottomans formally entered the war on the side of the Central Powers. Russia declared war on 1 November 1914. The first conflict with Russia was the Bergmann Offensive of Caucasus Campaign on 2 November 1914. -
First Battle of the Marne, (September 6–12, 1914), an offensive during World War I by the French army and the British Expeditionary Force (BEF) against the advancing Germans who had invaded Belgium and northeastern France and were within 30 miles (48 km) of Paris. -
On 25 April 1915, 16,000 Australians and New Zealanders, together with British, French and Indian troops, landed on the Gallipoli peninsula. The invasion was part of a campaign to capture the peninsula and help naval operations in the Dardanelles straits.