This was the way in which they perished, they and all their retinue.
Hdt. 5.21 Alexandros, the son of Amyntas, punishes the Achaemenid messengers of Megabazos for their ill treatment of the Macedonian women. He has them killed and his duplicity is hidden from Darius. Nevertheless, the Macedonians are under the thumb of Darius.
The Persians who had been sent as envoys came to Amyntas and demanded earth and water for Darius the king. He readily gave to them what they asked and invited them to be his guests, preparing a dinner of great splendor and receiving them hospitably.
Hdt. 5.18 Amyntas of Macedon surrenders to the Achaemenid messengers peacefully knowing that the forces of Macedonia are no match for the huge armies of Darius.
Then Megabazus, having made the Paeonians captive, sent as messengers into Macedonia the seven Persians who (after himself) were the most honorable in his army. These were sent to Amyntas to demand earth and water for Darius the king.
Hdt. 5.17 Megabazos, a proxy for Darius and the Achaemenid Empire, sends messengers to the Macedonians demanding their supplication. The messengers converse with Amyntas of Macedon.