In 1478 Kroia, which the Venetians had occupied after Scanderbeg's death, surrendered to Mahommed II., and in 1479 Scutari, after a memorable defence by the Venetians and their Montenegrin allies, was reduced by blockade.
Notwithstanding the abandonment of Christianity by a large section of the population after the Turkish conquest, the authority of the sultans was never effectively established, and succeeding centuries present a record of interminable conflicts between the tribesmen and the Turks, between the Christians and the converts to Islam, or between all combined and the traditional Montenegrin enemy.
At the same time Austria intervened in Montenegrin affairs and induced the sultan to withdraw his troops from the principality.
The Drina is formed on the Montenegrin frontier by the united streams of the Tara and Piva; curving north-eastwards past Visegrad, it marches for 102 m.
Its mountains, which belong to the Adriatic watershed, and form a continuation of the Montenegrin highlands, are less rounded and more dolomitic in character.