Arthashastra
तस्मिन् धन्विनं स्थापयेत्, त्रि धनुष्य् अश्वम्, पञ्च धनुषि रथं हस्तिनं वा ॥
Archers should be stationed at the distance of five bows (from one line to another); the cavalry at the distance of three bows; and chariots or elephants at the distance of five bows.
english translation
tasmin dhanvinaM sthApayet, tri dhanuSy azvam, paJca dhanuSi rathaM hastinaM vA ॥
hk transliteration by Sanscript