The Sicilian Wars, also known as the Greco-Punic Wars, were the longest-lasting conflict of the ancient world. This series of battles took place between 580 and 265 BCE and involved Carthage and the Greek city-states, primarily led by Syracuse, competing for control of Sicily and the Mediterranean region. Below is an excellent article about this conflict, including a discussion on the pivotal Battle of Alalia that occurred during this period.
https://www.labrujulaverde.com/en/2024/10/the-sicilian-wars-that-pitted-carthage-against-magna-graecia-were-the-longest-lasting-conflict-in-antiquity/
https://en.m.wikipedia.org/wiki/Sicilian_Wars