Passage: In the Time of Troubles, the monastery was ravaged by the Poles. During its recovery the last buildings — the tent-like church of Saint Martinian (1641), a two-tented barbican church (1650), and a bell-tower (1680) — were added to the complex. The belfry clocks (1638) are said to be the oldest in Russia.

Question: What happened when there was trouble?
the monastery was ravaged by the Poles