Great Zab
Heraclius had found a plain west of the Great Zab some distance from the ruins of Nineveh. This allowed the Byzantines to take advantage of their strengths in lances and hand-to-hand combat. Furthermore, fog reduced the Persian advantage in missile-shooting soldiers and allowed the Byzantines to charge without great losses from missile barrages. Walter Kaegi believes that this battle took place near Karamlays Creek.