At the end of the reign of Sultan Murad II, the number of ortas reached 100.
Initially, until the formation of the corps structure, the ortas were commanded by the yayabashi.
Already at the beginning of the 16th century, the janissary odjak united 196 ortas, of which 101 were from the jamaat subdivision, 34 from sekban and 61 were bölük.
The Acemi oğlan fire brigade, which is not a combat unit, but a training school for future janissaries, is also included in the corps.
In times of peace and war, they provide the Sultan's personal security.