After heavy mountain fighting, the Greeks made their way to the northern foothills of the mountains at the Centrites River, only to find a major Persian force blocking the route north. With the Carduchians surging toward the Greek rear, Xenophon again faced the threat of total destruction in battle. Xenophon's scouts quickly found another ford across the river, but the Persians moved and blocked this as well. Xenophon sent a small force back toward the other ford, causing the anxious Persians to detach a major part of their force. Xenophon stormed and completely overwhelmed the force remaining at his ford, while the Greek detachment made a forced march to this bridgehead. This was among the first attacks in depth ever made, 23 years after Delium and 30 years before Epaminondas' more famous use of it at Leuctra.