WORLD HISTORY

Detailed explanation-1: -German troops invaded Poland on September 1, 1939, triggering World War II. In response to German aggression, Great Britain and France declared war on Nazi Germany.

Detailed explanation-2: -The Causes of World War One Germany declared war on Russia in support of Austria and on France because of her alliance with Russia. Britain declared war on Germany in support of Belgium and France, and on Turkey because of her alliance with Germany.

Detailed explanation-3: -Nazi Germany’s invasion of Poland on 1 September 1939, and Britain and France’s declaration of war on Germany two days later marks the beginning of World War II. After the declaration of war, western Europe saw very little land or air active military confrontation at first, and the period was termed the “Phoney War".

Detailed explanation-4: -Britain and France declared war on Germany in September 1939 in response to the invasion of Poland. The period between September 1939 and April 1940 is often called the ‘Phoney War’ because, although war raged at sea, very little happened in Western Europe during this time.

Detailed explanation-5: -Britain and France entered the Second World War following the German invasion of Poland in September 1939. In expectation of a German advance westwards, the British Expeditionary Force (BEF), which grew to 390, 000 men over the winter of 1939–40, deployed alongside the troops of its allies in France and Belgium.