The romans were not good at sailing so they invented the corvus. The corvus helped them cross over to the enemies boat and attack.
Carthage wanted to beat Rome so they sent Hannibal to attack them. He went over the mountains on elephants. He tried to take the city for fifteen years. When he could not he started putting salt in the crops. Then the Romans attacked Carthage and Hannibal had to go back help.
Carthage was growing to strong so Rome decided to attack Carthage before they attacked again. After that they defeated Carthage.