The defeat of Sultan Beyezid I by Tamerlane at Ankara in 1402 opened a period of anarchy in the Ottoman Empire. Mircea took advantage of it to organise a new anti-Ottoman campaign: in 1403, he occupied the Genoese fort of Kilia at the mouths of the Danube. Thus in 1404, he could impose his authority on Dobruja. In 1416, Mircea supported the revolt against Sultan Mehmed I, led by Sheikh Bedreddin in the area of Deliorman, in Southern Dobruja.