Warships are the sign of a strong navy for a country. Warships are very important to naval strength because they not only carry artillery and long range missile tech, but these also include aircraft carriers. In wartime, the distinction between warships and merchant ships is often blurred. In war, merchant ships are often armed and used as auxiliary warships, such as the Q-ships of the First World War and the armed merchant cruisers of the Second World War. This video shows some of the biggest warships across the globe.