Cotys eventually set his eyes on the strategic Chersonese and the Hellespont, challenging the Athenian hegemony in the region. The Athenians were more than ready to fight for the control of the Hellespont, as it was vital for Athens' grain supply from the northern Black Sea region. An early invasion in 367 failed, but in 363/2 Cotys was more successful and repeatedly defeated several Athenian generals. Thus, the Chersonese and the Hellespont had come under direct Odrysian rule. This achievement, however, proved shortlived: much to Athens relief, Cotys I was eventually murdered in 360/59.