Some readings for your perusal:
Quran 8:60 Prepare against them whatever arms and cavalry you can muster that you may strike terror in the enemies of Allah, and others besides them not known to you. Whatever you spend in Allah’s Cause will be repaid in full, and no wrong will be done to you.
Quran 4.89 They desire that you should disbelieve as they have disbelieved, so that you might be alike; therefore take not from among them friends until they fly in Allah’s way; but if they turn back, then seize them and kill them wherever you find them, and take not from among them a friend or a helper.
Quran 8:7 Allah wished to confirm the truth by His words: Wipe the infidels out to the last.