Yes I do. And the reason why I asked you to post the context was to find out how deep was your learning of Islam and Quran. I apologize for the long post, but I have no other option.
4:89 http://abdurrahman.org/qurantafseer/ibnkathir/ibnkathir_web/4.11879.html
This is your answer is on the next page, but I would recommend you to read the entire explanation of 4:88-90 to actually understand the context.
"(If they withdraw not from you, nor offer you peace) meaning, revert to peaceful and complacent behavior,
(nor restrain their hands) refrain from fighting you,
(take (hold of) them), capture them,
(and kill them wherever you Thaqiftumuhum.), wherever you find them,
(In their case, We have provided you with a clear warrant against them), meaning an unequivocal and plain warrant."
5:32-34
32. Because of that, We ordained for the Children of Israel that if anyone killed a person not in retaliation of murder, or (and) to spread mischief in the land - it would be as if he killed all mankind, and if anyone saved a life, it would be as if he saved the life of all mankind. And indeed, there came to them Our Messengers with Al-Bayyinat, even then after that many of them continued to exceed the limits in the land!) (33. The recompense of those who wage war against Allah and His Messenger and do mischief in the land is only that they shall be killed or crucified, or their hands and their feet be cut off on opposite sides, or be exiled from the land. That is their disgrace in this world, and a great torment is theirs in the Hereafter.) (34. Except for those who (having fled away and then) came back (as Muslims) with repentance before they fall into your power; in that case, know that Allah is Oft-Forgiving, Most Merciful.
I don't think it needs any explanation. If someone wages a war against you, and are out to kill you and your entire family/tribe/nation, you will have no choice but to defend you till the threat is neutral, even if it requires killing the enemy.
Now I'll leave the rest for you to explore if you are interested.
May you find what you are looking for, insha'Allah