How a single Persian commander repelled a massive invasion of the Sasanian Empire
Between 614 and 616, the Sasanian Empire faced a dual threat from Hephthalite and Göktürk forces. Despite being vastly outnumbered by a reported 300,000 Göktürk troops, the Persian military, led by Smbat Bagratuni, managed to reorganize and decisively crush the invaders, ultimately securing the empire's eastern frontier through strategic combat.
The conflict began in 614 when Hephthalite forces launched a raid into eastern Persia. Their initial advance was halted near the fort of Tus in Khorasan, where they suffered a defeat. Seeking to reverse their fortunes, the Hephthalites appealed to the Khagan of the Göktürk Empire for military support. Historical accounts, specifically those attributed to Sebeos, suggest that the Göktürks responded by sending a massive force of 300,000 troops to bolster the Hephthalite ranks.
Upon arrival, the Göktürk forces successfully overran the region of Khorasan. However, they faced a significant tactical setback when they failed to breach the fort of Tus, which was held by a small garrison of only 300 defenders. A Sasanian army commanded by Prince Datoyean attempted to intercept the invaders but was defeated. Emboldened, the combined Hephthalite and Göktürk coalition pushed deeper into Persian territory, raiding as far as the cities of Ray and Isfahan.
The tide turned when the Khagan ordered the Göktürk forces to withdraw, effectively abandoning the Hephthalites to face the Sasanian military alone. Smbat Bagratuni, a key Persian commander, seized this opportunity to reorganize the eastern forces. In the ensuing confrontation, Smbat successfully crushed the remaining Hephthalite army. According to tradition, the conflict concluded with Smbat killing the Hephthalite leader in a decisive act of hand-to-hand combat, known as mard o mard. Following these military successes, Smbat was recalled to the Persian court, where he died in either 616 or 617, marking the end of this volatile period on the Sasanian frontier.
