Why did ancient Mediterranean fleets need large numbers of rowers?

In the ancient Mediterranean, naval warfare relied on specialized, oar-driven warships that required large numbers of rowers to achieve the speed and maneuverability necessary for combat. Unlike merchant vessels, which prioritized cargo capacity and relied on sails, warships were designed for tactical agility, allowing them to engage in ramming maneuvers and rapid repositioning during battle.123

The need for high performance led to the development of vessels like the trireme, which utilized three vertically superimposed banks of oars to maximize propulsive power without excessively increasing the ship's length. By concentrating human muscle power, these ships could reach speeds of up to 7–9 knots, providing the force required to disable enemy hulls with a bronze-clad ram.342

Because these galleys were lightly constructed and lacked the space for significant provisions, they were not designed for long-endurance voyages. Instead, they were optimized for short-range, high-intensity naval warfare, where the ability to maneuver at any time—independent of wind conditions—was a critical tactical advantage.41