Best Ever Q&A Space Our World Nature History Early Civilizations Ancient Egypt Ancient Greece Biblical Times Ancient Rome Middle Ages Early Africa Early America Great Explorers Industrial Revolution World Wars Science & Technology	World Wars What were the main alliances during the First World War? What was D-Day? What kind of weapons were used in the Second World War? Who led the Germans during the Second World War? What was trench warfare? What caused the outbreak of the First World War? When were aircraft first used in battle?   Previous: Back to World Wars Book: Best Ever Q&A Section: History Chapter: World Wars