Teymourtash's active involvement in constitutional gatherings led, in due course, to his appointment as Chief of Staff of the populist constitutionalist forces resisting the reigning Monarch's decision to storm the buildings of Parliament. The constitutionalists forces eventually took sanctuary in Parliament to demand constitutionally entrenched rights and safeguards. Throughout the period, Teymourtash remained directly involved by training members of the constitutionalist volunteer militia, and demonstrated much bravery when clashes took place with the better trained and more numerous royalist forces. Despite the staunch efforts of the constitutionalists, the royalist forces prevailed by storming Parliament and dissolving the National Assembly.