6 events the sources record for this year, grouped by region.
What happened
China (1)
Wang Jian took from south of Chen to Pingyu, captured the King of Chu; in the twenty-fourth year Xiang Yan set up Changping Jun and was defeated, so Changping Jun died and Xiang Yan committed suicide. (Records of the Grand Historian (Shiji), Annals 史記卷006 秦始皇本紀)
Southern Europe (5)
Aratus is blamed for handing Corinth over to Antigonus as a gift on Achaea's behalf (Plutarch's Parallel Lives Plut. Aratus 45)
Achaea offers to hand Acrocorinth to Antigonus; the two sides face off at the Isthmus (Polybius, Histories 2.52)
Achaea takes Argos and Cleomenes returns to Sparta (Polybius, Histories 2.53)
Antigonus takes over Acrocorinth and is acclaimed supreme commander (Polybius, Histories 2.54)
Rhodes earthquake — after the Colossus falls, kings send aid (the year comes from the translation's chronology) (Polybius, Histories 5.88)