 Probus then seems to have followed Timagenes upriver to the fortress of Babylon (located at the head of the Nile delta, now a suburb of modern Cairo), thus cutting off the enemy's escape route to Syria.However, using his knowledge of the surrounding country, Timagenes seized the summit of a nearby mountain with 2,000 men and, launching a surprise attack on Probus' army, defeated it utterly.Probus was captured and, in the Roman heroic tradition, chose to kill himself rather than bear the ignominy of defeat.