Which Came First

Which one of the following World War Two battles/operations began first?

• Battle of Okinawa
• Battle of Monte Cassino
• Battle of Iwo Jima
• Ardennes Offensive
• Battle of Leyte

Which one of the following events took place first?

• Norman Conquest of England
• Beginning of the First Crusade
• Japan's Gempei War
• Mongol Invasion of Russia (Kiev)
• Beginning of the Hundred Years' War

Which one of the following advances in military technology occurred first?

• Dynamite patented by Alfred Nobel
• First Gatling Gun patented
• First rigid dirigible built by Ferdinand von Zeppelin
• Radar patented by Christian Hulsmeyer
• First liquid-propellant rocket launched