Strabo refers to the city as once a rendezvous for the Persians in their expeditions against Egypt. According to historians such as Diodurus Siculus and Strabo, King Cambyses II attacked Egypt after massing a huge army on the plains near the city of Acre. In December 2018 archaeologists digging at the site of Tell Keisan in Acre unearthed the remains of a Persian military outpost that might have played a role in the successful 525 B.C. Achaemenid invasion of Egypt. The Persian-period fortifications at Tell Keisan were later heavily damaged during Alexander's fourth-century B.C. campaign to drive the Achaemenids out of the Levant.