The assassination of Archduke Franz Ferdinand of Austria on 28 June 1914 in Sarajevo by Gavrilo Princip, a member of the Young Bosnia organisation, led to Austria-Hungary declaring war on Serbia, on 28 July. Local war escalated when Germany declared war on Russia and invaded France and Belgium, thus drawing Great Britain into the conflict that became the First World War. Serbia won the first major battles of World War I, including the Battle of Cer, and the Battle of Kolubara, marking the first Allied victories against the Central Powers in World War I.