If you [disbelievers] seek the victory - the defeat has come to (8:19)

﴿إِن تَسْتَفْتِحُوا فَقَدْ جَاءَكُمُ الْفَتْحُ ۖ وَإِن تَنتَهُوا فَهُوَ خَيْرٌ لَّكُمْ ۖ وَإِن تَعُودُوا نَعُدْ وَلَن تُغْنِيَ عَنكُمْ فِئَتُكُمْ شَيْئًا وَلَوْ كَثُرَتْ وَأَنَّ اللَّهَ مَعَ الْمُؤْمِنِينَ﴾
[ الأنفال: 19]

8:19 If you [disbelievers] seek the victory - the defeat has come to you. And if you desist [from hostilities], it is best for you; but if you return [to war], We will return, and never will you be availed by your [large] company at all, even if it should increase; and [that is] because Allah is with the believers.

If you ask O idolaters, for the punishment and might of Allah to fall upon the wrongdoers who overstep the limits, then Allah has already made what you asked afflict you, sending down on you what was a lesson for you and for the mindful.
If you stop asking for this it would be better for you, so that He might give you time, not giving you what you deserve immediately.
But if you return to asking for a judgement and fighting the believers, Allah would also return by afflicting you with punishment and helping the believers.
Your people and helpers would not be of any good to you, even if they are many and well prepared and the believers were few in number.
Allah is with the believers, helping and supporting them, and whomever Allah assists, then no one will be able to defeat them.

(O disbelievers) if you ask for a judgement, now has the judgement come unto you and if you cease (to do wrong), it will be better for you, and if you return (to the attack), so shall We return, and your forces will be of no avail to you, however numerous it be, and verily, Allah is with the believers.

phonetic Transliteration

In tastaftihoo faqad jaakumu alfathu wain tantahoo fahuwa khayrun lakum wain taAAoodoo naAAud walan tughniya AAankum fiatukum shayan walaw kathurat waanna Allaha maAAa almumineena

Abdullah Yusuf Ali - Translation

(O Unbelievers!) if ye prayed for victory and judgment, now hath the judgment come to you: if ye desist (from wrong), it will be best for you: if ye return (to the attack), so shall We. Not the least good will your forces be to you even if they were multiplied: for verily Allah is with those who believe!

Safi-ur-Rahman al-Mubarakpuri

(O disbelievers) if you ask for a judgement, now has the judgement come unto you; and if you cease (to do wrong), it will be better for you, and if you return (to the attack), so shall We return, and your forces will be of no avail to you, however numerous they be; and verily, Allah is with the believers.

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