Afterdeclared war on Russia to help - (who was attacked by Russia after they attacked Serbia), France made clear their intent to stand by their ally (Russia, obviously), so Germany declared war on them, too, planning to take them out then go after Russia to prevent a two-front war. Unluckily for Germany, Russia prepared pretty quickly so Germany had to send troops to the Eastern Front as well and fight a two-front war.
Why did germany declare war on france?
It didn't. Germany started invading other countries which made France and the UK declare war on Germany.
France, Germany, and Britain vs. Russia and Serbia.
France declared war on Germany on 3 September 1939, a few hours after Britain.
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Its invasion of poland in 1939.
It was when Germany invaded Poland.
declare war on Germany
France and Britain had promised to declare war if Germany tried to obtain anymore territory. And they kept that promise when Poland was invaded.
England and France declared war on Germany after Germany, (and Russia), invaded Poland.
England and France declared war on Germany in WWI and WWII.
Because Germany attacked France
Germany after they invaded poland, austria, and france
World War II officially began after Germany invaded Poland. The invasion of Poland caused England and France to declare war on Germany.
the event was when Germany invaded Poland. when Britain and France found out they declare war on Germany.
When Germany invaded Poland on September 7, 1939 and quickly overran it.
The USA declared war on Germany, after it was revealed that Germany wanted Mexico to declare war on the USA, and after Germany said they would resume submarine sinking of civilian, neutral ships carrying supplies to England and France.