Bonaparte sent General Pierre Augereau to Paris to lead a "coup d'état" and purge the royalists on 4 September—Coup of 18 Fructidor. This left Barras and his Republican allies in control again but dependent on Bonaparte, who proceeded to peace negotiations with Austria. These negotiations resulted in the Treaty of Campo Formio, and Bonaparte returned to Paris in December as a hero. He met Talleyrand, France's new Foreign Minister—who served in the same capacity for Emperor Napoleon—and they began to prepare for an invasion of Britain.