The reaction to Austria’s declaration of war

1. Ally List

1.1. Russia-Serbia

1.2. Germany-Austria

1.3. Russia-France

2. Russia moved its army toward Austria and Germany

2.1. Russia, Serbia's ally, started to move its army towards the Russian-Austrian border. At the same time, Russia mobilized along the German border because they expected Germany to join its ally, Austria.

3. German government declared war on Russia

3.1. To Germany, Russia's mobilization amounted to a declaration of war

4. Germany declared war on France

4.1. France was Russia's ally. When Germany had declared war on Russia, Russia looked to them for help. But, before France responded, Germany declared war on them, expecting they would side with Russia

5. Great Britain declared war on Germany