United Kingdom declaration of war upon Germany (1914)
From Tardis Wiki, the free Doctor Who reference
In the conflict of 1914, the United Kingdom, bound by the Anglo-French alliance, declared war against Germany when it invaded Belgium, itself allied with France. This brought in Britain's colonies including Australia, New Zealand, Canada, South Africa and India. Japan, which had an agreement with Britain, also entered the war. (PROSE: The Time Traveller's Almanac)
