Quinqueremes combined the size needed for battle with the ability to build substantial fleets. Their rams pierced an enemy hull and could tear the opening wider as they were pulled out. Soldiers bought the time needed to withdraw. They could board the damaged ship or prevent its crew from boarding their own vessel while the two hulls remained close.
Notable Point · 47:00-48:38
Soldiers protect a galley while its ram withdraws
A ram could enlarge the hole as it pulled free, while soldiers protected the ship during the vulnerable withdrawal.