Neville Chamberlain did so as Prime Minister.
Great Britain declared war on Germany in September 1939 after Germany invaded Poland.
Britain declared war on Germany on August 4, 1914 after Germany invaded Belgium.
Germany. Answer: yes Germany but Italy and Japan also declared war against Britain.
September 1, 1939. Germany invaded Poland. Great Britain and France declared war on Germany.
The Rhineland, Austria, Czechoslovakia, and Poland. Once Germany invaded Poland, Great Britain and France declared war on Germany starting World War Two.
World War I:When Great Britain declared war on Germany on August 4th, 1914 Canada's status as subservient to Great Britain meant that it too was now at war.World War II:Britain declared war on Germany after the German invasion of Poland on September 1st, 1939. Canada followed suit, one week after Great Britain, on the tenth of the month.
Australia declared war on Germany as well.
Great Britain and France declared war on Germany, when Germany invaded Poland - so began the second World War in Europe.
The Prime Minister of England was Neville Chamberlain when Great Britain declared war on Germany on Sept 3, 1939
Britain told Germany to remove their troops from Poland. Germany refused and Britain declared war on them
The prime minister of Britain declared war in Germany. The world war 2 started by Germany in a unprovoked attack on poland.
At 11.00 pm on 4th August 1914, Britain declared war on Germany. they joined the war to back up belgium when Germany broke their treaty and protect themselves.