"Also called The Great War, World War I was one of the deadliest conflicts in history, and set the stage for another world war just 20 years later. It was known as “The Great War”—a land, air and sea conflict so terrible, it left over 8 million military personnel and 6.6 million civilians dead."
That Claudius is a true villain when hamlet found out that he was going to kill him laertes dad got tricked and so laetes was going to kill hamlet for Claudius