In the name of Allah most gracious most merciful
Assalaamu alaykum wa rahmatuallahi wa barakatuhu

How To Restrain Fury Of Unbelievers/Kuffar ?

Fight & Allah Will Restrain The Fury Of Unbelievers
4:84 Then fight in Allah's cause thou art held responsible only for thyself and rouse the believers. It may be that Allah will restrain the fury of the unbelievers: for Allah is the strongest in might and in punishment.

Make Proper Investigation Via Authority

4:83 When there comes to them some matter touching (public) safety or fear they divulge it. If they had only referred it to the Apostle or to those charged with authority among them the proper investigators would have tested it from them (direct). Were it not for the Grace and Mercy of Allah unto you all but a few of you would have fallen into the clutches of Satan.

Recommend Good To Each Other
4:85 Whoever recommends and helps a good cause becomes a partner therein: and whoever recommends and helps an evil cause shares in its burden: and Allah hath power over all things.

Allah Turned Back Their Fury When Muslims Fought

33:22 When the Believers saw the Confederate forces they said: "This is what Allah and His Apostle had promised us and Allah and his Apostle told us what was true." And it only added to their faith and their zeal in obedience.
23 Among the Believers are men who have been true to their Covenant with Allah: of them some have completed their vow to (the extreme) and some (still) wait: but they have never changed (their determination) in the least:
24 That Allah may reward the men of Truth for their Truth and punish the Hypocrites if that be His Will or turn to them in Mercy: for Allah is Oft-Forgiving Most Merciful.
25 And Allah turned back the Unbelievers for (all) their fury: no advantage did they gain and enough is Allah for the Believers in their fight. And Allah is full of Strength Able to enforce His Will.
26 And those of the people of the Book who aided them Allah did take them down from their strongholds and cast terror into their hearts (so that) some ye slew and some ye made prisoners.
27 And He made you heirs of their lands their houses and their goods and of a land which ye had not frequented (before). And Allah has power over all things.

Lets Follow Prophet Muhammad salla lahu alaihi wa sallam In Word & Deed

33:21 Ye have indeed in the Apostle of Allah a beautiful pattern of (conduct) for anyone whose hope is in Allah and the Final Day and who engages much in the praise of Allah.

Allah Knows Best