Class warfare is a type of warfare in which the classes of society are pitted against each other. It is often used to describe the struggle between the wealthy and the poor. CLASS='font-bold underline-link hover:text-barberry-yellow'>TRENCH warfare is a type of warfare in which opposing forces fight from trenches dug into the ground. This type of warfare was used extensively during World War I. GERM warfare is a type of warfare in which biological agents, such as bacteria or viruses, are used to cause disease and death. This type of warfare has been used throughout history, but has become increasingly controversial in recent years.