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| Sabzevar expedition | |||||||||
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| Part of Nader's Campaigns | |||||||||
 An artist's impression of a gunpowder depot in northern Persia (eighteenth century). | |||||||||
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| Belligerents | |||||||||
| Nader's Forces |
 Safavid dynasty | ||||||||
| Commanders and leaders | |||||||||
| Nader |
Tahmasp II  | ||||||||
| Strength | |||||||||
| Unknown | Unknown | ||||||||
| Casualties and losses | |||||||||
| Minimal | Minimal | ||||||||
The Sabzevar expedition was a politically decisive event in Nader's career where he in effect turned from mere commander-in-chief of Tahmasp's forces into the real power behind the throne (although technically this still was a government in exile as the Gilzai Afghans were in control of Isfahan). The expedition was launched mainly due to Tahmasp's own incompetence and ill-thought attempt at curbing the powers of his upstart general and military genius.