Arthashastra
पुरस्ताद् अध्याघाते मकरेण यायात्, पश्चात् शकटेन, पार्श्वयोर् वज्रेण, समन्ततः सर्वतो भद्रेण, एक अयने सूच्या ॥
In case of any obstruction, the army should march in crocodile array in the front, in cart-like array behind, and on the sides in diamond-like array (i.e., in four or five rows, each having its front, rear and sides) and in a compact array on all sides. When the army is marching on a path passable by a single man, it should march in pin-like array.
english translation
purastAd adhyAghAte makareNa yAyAt, pazcAt zakaTena, pArzvayor vajreNa, samantataH sarvato bhadreNa, eka ayane sUcyA ॥
hk transliteration by Sanscript