During which war was the famous Christmas Truce observed between opposing forces?

World War I

Which board game uses hexagonal tiles featuring different landscape types? What popular holiday activity in North America involves riding in a vehicle pulled by horses through snowy terrain? Which food has a higher potassium content per gram than bananas? What sweet Indian dessert is made by soaking small dough balls in sugar syrup? What rock band released the song "Smells Like Teen Spirit" in 1991?