Which empire had a very strong army and was incredibly aggressive?

Four empires or kingdoms had emerged within fifty years of Alexander’s death: the Ptolemies had Egypt; the Seleucids (descendants of Seleucus) had much of Asia; the Antigonids (descendants of Antigonus the One-Eyed) held Macedon; and the Attalids held Pergamum. But the ethos of these kingdoms, and of the kings themselves, was incredibly aggressive.

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