Answer:
British Prime Minister Winston Churchill's first speech as prime minister was a remarkable speech in their history. Because at that time they were on war with Nazi forces. In his speech he motivated the British people to stand strong against Nazi forces by addressing the Nazis as 'monstrous tyranny'. He said his aim is to win over this monstrous tyranny, who committed serious war crime. So the 'monstrous tyranny' refers to the Nazi forces of Germany.
Explanation:
Joan of Arc led the French to several military victories during the Hundred Year's War.
What war are you asking about?