When Germany invaded Poland, Britain and France had an agreement with Poland to come to Poland's aid should the country ever be invaded. As Germany refused to withdraw from Poland, Britain and France declared war against Germany.
Poland
In WW2 the French and Britain said they would declare war on Germany if they attacked Poland. When Nazi Germany invaded Poland France and Britain declared war on Germany. Then Germany stormed French.
Germany invaded France and Poland also it invaded Austria. World War 2 started because Germany said to England they wouldn't invade Poland but they did - so Poland is the easiest country to remember that was invaded!
Britain.
France. Germany and France share a border.
France and Britain declared war on Germany.
I'm learning in class that the Germany invaded Poland and the aliies France and Britain declared war?
Britain and France
Because at 1 September 1939 Germany invaded Poland.
Britain and France joined the war, becaus Germany invaded Poland. The reason for this is that Britain and France had a pact with Poland, Denmark and Belgium.
I presume you are talking about WW2. Britain & France had a treaty with Poland to ensure Poland's safety and when Germany invaded Poland in 1939 this treaty was violated and therefore Britain & France had no option but to go to Poland's aid