The word peleará is the future form of pelear in the third person singular.
See the full pelear conjugation

pelear

Mi ejército peleará por un lado y luego por el otro.
My army will fight for one side and then the other.
La batalla es del Señor. ÉL peleará por mí.
The battle is the Lord's! He shall fight for me.
Mi ejército peleará por un lado y luego por el otro.
My army will fight for one side, and then the other.
La gente solo peleará de verdad por lo que es justo.
People will only truly fight for what is right.
El hombre peleará una lucha por su sobrevivencia.
Man will fight a struggle for his survival.
Dime, ¿realmente crees que Esparta peleará?
Tell me, do you really believe that Sparta will fight?
Me pregunto si él peleará en el evento.
I wonder if he's been training for the event.
¿Se refiere a si peleará o no?
You mean as to whether he'll fight or not?
¿No me digas que peleará a nuestro lado?
Don't tell me he's going to fight alongside us?
¿Crees que ese Batman peleará con él?
Do you think this Batman will fight him?
Él llegó a un acuerdo con la Ahnenerbe y peleará a su lado.
He reached an agreement with the Ahnenerbe and will fight on their side.
Nadie peleará esta batalla por ti.
No one's gonna fight this battle for you.
Esta es mi pelea. Y seré yo quien la peleará.
This is my fight and I'll be the one to fight it.
Porque si tengo dos entonces uno peleará con el otro.
Because if I have two then the other will fight with the other one.
Y la gente debe saber que el Buscador peleará por ella.
And the people must know that the Seeker will stand and fight for them.
Es su caso, peleará por él.
It's his case, he'll fight for it.
Aquí es donde se peleará la guerra.
This is where the war will be fought.
Pero se peleará a la manera francesa.
But it will be fought the French way.
Todos y cada uno de ustedes peleará por sobrevivir.
Everyone on this base, every one of you, is fighting for survival.
Si no le ofrecemos algo, peleará.
If we don't make him an offer, he will.
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