peleasen
-they fought
The word peleasen is the imperfect subjunctive form of pelear in the third person plural.
See the full pelear conjugation

pelear

Y he hecho todo lo posible para que no se peleasen.
And I did everything I can to stop them from fighting.
Y he hecho todo lo posible para que no se peleasen.
And I did everything I can to stop them from fighting.
Se aburrirían si no se peleasen.
They'll be bored if they didn't fight.
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