Poland.
Britain declared war on Germany on September 3, 1939. This declaration came shortly after Germany invaded Poland on September 1, 1939, prompting Britain and France to respond in defense of Poland. The formal declaration marked the beginning of Britain's involvement in World War II.
Great Britain and the United States were allies to defeat Germany so the US would not attack Great Britain.
Germany invaded Belgium. Britain had a defense treaty with Belgium. After the invasion, Britain issued an ultimatum stating that if Germany didn't withdraw from Belgium, Britain would declare war. Germany didn't listen and Britain entered World War I.
Stalin became his allie
Poland.
Czechoslovakia
if you mean which country it was Poland
The 1939 invasion of Poland caused Britain to declare war on Germany, which started WWII.
Belgium .
To response to Germany invasion of Belgium.
Germany didn't declare war in 1915 against anyone, it was actually Britain that declared war on Germany
Britain was the first to declare war on Germany and New Zealand and the rest of the commonwealth felt like they wanted to help britain defeat germany
1939
He didn't. Britain declared war with Germany.
Germany attacked a Poland A British ally.
To response to Germany invasion of Belgium.