This is the 14793rd most frequent Russian word.
пленными
"Пленными" means "captives" or "prisoners" in English.
Here, 'пленных' is in the accusative plural form of the word 'пленный,' which means 'captive' and indicates people who are captured or imprisoned.
Мы освободили пленных из лагеря.
We freed the captives from the camp.
In this sentence, 'пленных' is in the genitive plural form after 'о,' which is commonly used with the prepositional case in Russian to denote 'about' or 'concerning.'
Рассказ о пленных был трогательным.
The story about the captives was touching.
Here, 'пленным' is in the dative plural form, used to indicate the indirect object of the action, i.e., to whom the help was given.