And whoever turns his back to them on such a day, unless (8:16)

Almuntakhab Fi Tafsir Alquran Alkarim

And he who turns his back, reverses his course or retreats, unless it be a stratagem for gaining advantage over the enemy or for falling back on other troops projected and directed as the larger military movement and operation of the campaign, will have come within the measure of Allahs wrath and be destined to the abode in Hell, and how evil is the destination

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(8:16) For he who turns his back on them on such ar occasion - except that it be for tactical reasons, or turning to join another company - he shall incur the wrath of Allah and Hell shall be his abode. It is an evil destination.  *13

And whoever turns his back to them on such a day, unless meaning

*13). The Qur'an does not forbid orderly retreat under strong pressure from the enemy provided it is resorted to as a stratagem of war, for example seeking reinforcements or joining another party in the rear. What the Qur'an does forbid is disorderly flight produced by sheer cowardice and defeatism. Such a retreat takes place because the deserter holds his life dearer than his cause. Such cowardice has been characterized as one of those three major sins which, if committed, can be atoned for by no other good deed whatsoever. These three sins are: ascription of divinity to anyone or anything other than God, violation of the rights of parents, and flight from the battlefield during fighting in the way of God. (See al-Mundhiri, 'Kitab al-Jihad', 'Bab al-Tarhib min al-Firar min al-Zahf'- Ed.) In another tradition the Prophet (peace be on him) has mentioned seven deadly sins which totally ruin a man's Next Life. One of these is flight from the battlefield in an encounter between Islam and Unbelief. (Muslim, 'K. al-lman', 'Bab al-Kabi'ir wa Akbaruha'; Bukhari, 'K. al-Wasaya', 'bab - fi Qawl Allah - Tala: inna al-ladhina Ya'kuluna Amwal al-Yatami Zulman' - Ed.) This has been declared a deadly sin because in addition to being an act of sheer cowardice, it demoralizes others and can generate demoralization which can have disastrous consequences. An individual soldier's desertion might cause a whole platoon, or even a whole regiment, and ultimately the whole army, to take flight. For once a soldier flees in panic, it is hard to control the others.
 

And whoever turns his back to them on such a day, unless meaning in Urdu

جس نے ایسے موقع پر پیٹھ پھیری، الا یہ کہ جنگی چال کے طور پر ایسا کرے یا کسی دُوسری فوج سے جا ملنے کے لیے، تو وہ اللہ کے غضب میں گھِر جائے گا، اُس کا ٹھکانہ جہنم ہوگا، اور وہ بہت بُری جائے بازگشت ہے