An ancient war galley is a type of ship that was used in warfare during the classical period. It was typically propelled by three banks of oars, hence the term TRIREME (7 letters). Triremes were used by the Greeks and Romans to transport troops and engage in naval battles. They were also used by other civilizations such as the Phoenicians and Egyptians. Triremes were fast and maneuverable, making them ideal for naval warfare.