Diviš Bořek started his career as a poor, rural nobleman of Czech origin, seated at small stronghold named Miletínek, near the village Miletín in northeastern Bohemia.

It allowed him in following year to conquer and loot nearby Benedictine monastery at Opatovice nad Labem and subsequently the very same fate prepared for the Cistercian convent in Sezemice.

In June and July 1423 he and captain Bedřich of Strážnice led a campaign to Moravia, in which they defeated the armies of Jan XII Železný ("the Iron"), Bishop of Olomouc and the Duke Přemek I of Opava.

In later years he was one of the leaders of the moderate Hussites and stood in the forefront of the combined armies of the Utraquists and the Catholics loyal to King Sigismund of Luxembourg.

This coalition defeated in the decisive Battle of Lipany (30 May 1434) joined armies of the Sirotci (Orphans) and Taborites which meant the definitive end of the Hussite Wars.