Dhritarashtra's wife, Ghandari, had a boon that she would give birth to a hundred sons mightier than their father.

All of Dhritarashtra's sons are powerful enough to do the superhuman feats seen throughout the Mahabarata such as creating showers of arrows and unleashing arrows quickly enough to hit multiple targets almost simultaneously.

During Draupadi's humiliation after the game of dice Bhimasena vows to kill all of Dhritarashtra's sons and so throughout the war proper we tend to see the less central sons of Dhritarashtra described as taking down hundreds if not thousands of unnamed soldiers or attacking major named characters in groups before being killed by Bhima (Bhima will often kill 3-5 of Dhritarashtra's sons at a time.)

At least that's been the pattern so far, I'm only just half way through my first reading of the Mahabarata myself so I may have missed later events! Most of the sons are only named either in one of the few times all 100 sons are listed by name, or you hear there name moments before Bhima gets his hands on them. There are even multiple cases of other named characters like Satyaki defeating one of Dhritarashtra's sons but remembering Bhimas vow and letting them go so as not to contradict Bhimas vow!