al-Sharif al-Radi (d. 406 AH) · Thaqalayn library edition, reproduced verbatim
فَإذَا نزَلتُمْ بِعَدُوٍّ أَوْ نَزَلَ بِكُمْ، فَلْيَكُنْ مُعَسْكَرُكُمْ فِي قُبُلِ الْأَشْرَافِ، أَوْ سِفَاحِ الْجِبَالِ، أَوْ أثْنَاءِ الْأَنْهَارِ، كَيْما يَكُونَ لَكُمْ رِدْءاً، وَدُونَكُمْ مَرَدّاً، وَلْتَكُنْ مُقَاتَلَتُكُمْ مِنْ وَجْهٍ وَاحِدٍ أَوِ اثْنيْنِ، واجْعَلُوا لَكُمْ رُقَبَاءَ فِي صَيَاصِي الْجِبَالِ، وَمَنَاكِبِ الْهِضَابِ، لِئَلاَّ يَأْتِيَكُمُ الْعَدُوُّ مِنْ مَكَانِ مَخَافَة أَوْ أَمْنٍ.
When you proceed towards the enemy or he proceeds towards you, the position of your force should be on the approaches high ground or on the edges of mountains or the bends of rivers, so that it may serve you as a help and a place to return to. Your encounter should be from one side or two sides. Place watchers on the peaks of mountains and the raised sides of the high ground so that the enemy may not approach you from any place, whether of danger or safety.
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