July 5th: Austrian government asks
German government to support Austria
in a war against Russia, if Russia
supports Serbia. Germany says they
will support whatever the Austrian
government decide to do.
July 23rd: The
Austrian
government
sends the Serbian
government an
ultimatum.
July 25th: The Serbians
accept all the conditions
except one - that Austrian
police should be allowed into
Serbia.
July 28th:
Austria-Hungary
declares war on
Serbia.
July 30th: The
Russian army is
mobilised.
August 1st:
Germany
declares war
on Russia.
August 3rd: Germany
declares war on France
and, following the
Schlieffen Plan, attacks
Belgium.
August 4th: Britain keeps the
promise made in a treaty of 1839 to
defend Belgium, and declares war on
Germany.
The Schlieffen Plan
Based on the theory that
Germany would be at war with
France and Russia at the same
time.
It did not prepare for
many of the events that
occured in July and
August 1914. It was
based on the belief that, if
the country went to war,
Germany would be faced
with a war on two fronts
with France and Russia.
The plan assumed that
France was weak and could
be beaten quickly, and that
Russia was much stronger,
but would take longer to
mobilise its army.
The plan began to go wrong on 30
July 1914, when Russia mobilised
its army, but France did not.
Germany was forced to invent a
pretext to declare war on France (3
August 1914).
Things got worse when Britain declared
war on Germany on 4 August 1914
because, in a Treaty of 1839, Britain had
promised to defend Belgium.