Arthashastra
सम विषम निम्न स्थल ह्रस्व दीर्घ वशेन वा अध्वनो यात्रां विभजेत् ॥
One should prepare a programme of short and long distances to be marched in accordance with the nature of the ground to be traversed, viz., even ground, uneven ground, valleys and plains.
english translation
sama viSama nimna sthala hrasva dIrgha vazena vA adhvano yAtrAM vibhajet ॥
hk transliteration by Sanscript