Pyotr Semyonovich Isaev (Russian: Пётр Семёнович Исаев; better known as Petka (Russian: Петька) or Pete; April 20, 1890 – September 5, 1919) was a participant in World War I and the Russian Civil War, assistant to a Red Army commander Vasily Chapayev and commander of the communications battalion. Thanks to the vivid image of Petka in the film Chapaev, he became the hero of numerous anecdotes about Petka, Vasily Ivanovich and Anka the Machine-Gunner.