By the end of the 13th century, the military declined and the army was reduced to fewer than 10,000 men—it was recorded that Ivaylo defeated two Byzantine armies of 5,000 and 10,000 men, and that his troops were outnumbered in both cases.
13. sajandi lõpuks käis sõjavägi alla ja armee oli kahanenud vähem kui 10 000 meheni – on kirja pandud, et Ivailo võitis kahte Bütsantsi (5000 ja 10 000 mehelist) armeed ja et tema väed olid mõlemal juhul arvulises vähemuses.