How many letters were written in World War 1 from soldiers?

What does the double v campaign stand for? What were the conditions as a soldier? What was the name of the ship that became a part of a battle cry? What were soldiers responsible for? What new weapon helped the English defeat the french? When was Bell Helicopter created? What is something knights wore on their heads? Did the gunpowder plot have knock on effect and if so why? What are two interesting facts about the San Juan Capistrano? How where bombs defused in World War 2? The Kansas-Nebraska Act and the Dred Scott decision overturned what 1820 compromise which banned slavery in the territories draw from the northern part of the Louisiana Purchase? Was D-Day a successful invasion? Why women lose attraction in their husbands? Where was the first place that Japan attacked in china? How was Vietnam divided before the war? Where was testing of nuclear weapons not been according to the nuclear test ban treaty signed in 1963? What factors helped cause World War 1? Why is December 7 1941 important in WW2? In the event of isolation during operations other than war what is a reason to delay contact with legitimate authorities? Why was arpanet important in the cold war?