sentences:  The boyars fought among themselves, the lower classes revolted blindly, and foreign armies occupied the Kremlin in Moscow, prompting many to accept Tsarist autocracy as a necessary means to restoring order and unity in Russia.The Time of Troubles included a civil war in which a struggle over the throne was complicated by the machinations of rival boyar factions, the intervention of regional powers Poland and Sweden, and intense popular discontent, led by Ivan Bolotnikov.False Dmitriy I and his Polish garrison were overthrown, and a boyar, Vasily Shuysky, was proclaimed tsar in 1606.