John of Ephesus noted in 581: "the accursed people of the Slavs set out and plundered all of Greece, the regions surrounding Thessalonica, and Thrace, taking many towns and castles, laying waste, burning, pillaging, and seizing the whole country." However, John exaggerated the intensity of the Slavic incursions since he was influenced by his confinement in Constantinople from 571 up until 579. Moreover, he perceived the Slavs as God's instrument for punishing the persecutors of the Monophysites. By the 580s, as the Slav communities on the Danube became larger and more organised, and as the Avars exerted their influence, raids became larger and resulted in permanent settlement. By 586, they managed to raid the western Peloponnese, Attica, Epirus, leaving only the east part of Peloponnese, which was mountainous and inaccessible. In 586 AD, as many as 100,000 Slav warriors raided Thessaloniki. The final attempt to restore the northern border was from 591 to 605, when the end of conflicts with Persia allowed Emperor Maurice to transfer units to the north. However he was deposed after a military revolt in 602, and the Danubian frontier collapsed one and a half decades later (see Maurice's Balkan campaigns).