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The action which was caused by germany which led to to the start of World War 2 in the European theatre was the Invasion of poland in september 1939
France and Britain declared war onto Nazi Germany on September 1st 1939. This was the official date of the starting of World War 2.
France and Britain declared war on Germany in response to the invasion of Poland
When Germany invaded Poland, France and England declared war on Germany, this started WWll
The 1939 invasion of Poland caused Britain to declare war on Germany, which started WWII.
The specific reason was that German forces invaded Belgium on their way to France. Britain, France and Prussia (the key forerunner of Germany) had guaranteed Belgian neutrality in 1839 (and again in 1875). Moreover, Britain was an ally of France and was not willing to let a substantial part of the coast opposite Britain fall into unfriendly hands.