Vous avez cherché: fight the unbeatable foe (Anglais - Latin)

fight the beast
bestia occidere

fight the good fight
bonum certamen certare

defend the week fight the strong
praesidio infirma

fight the good fight of faith, hope
certa bonum certamen fides spes caritas

the boys are taught by the sailors to fight the greeks with swords.
pueri ab nautis graecos pugnare gladiis docentur.

fight the good fight of faith, lay hold on eternal life, whereunto thou art also called, and hast professed a good profession before many witnesses.
certa bonum certamen fidei adprehende vitam aeternam in qua vocatus es et confessus bonam confessionem coram multis testibu

s hurtful and the rest of those killed by the supporters of brutus and cassius, octavian and antony to fight the plans they had, and they began to force is not right.
bruto cassioque et ceteris conspira toribus interfectis, octavianus antoniusque consilia dissimila habebant et pugnare coeperunt.

and saul said to david, behold my elder daughter merab, her will i give thee to wife: only be thou valiant for me, and fight the lord's battles. for saul said, let not mine hand be upon him, but let the hand of the philistines be upon him.
dixit autem saul ad david ecce filia mea maior merob ipsam dabo tibi uxorem tantummodo esto vir fortis et proeliare bella domini saul autem reputabat dicens non sit manus mea in eo sed sit super illum manus philisthinoru