Arthashastra
एक अयन मार्ग प्रयातस्य सेना निश्चार ग्रास आहार शय्या प्रस्तार अग्नि निधान ध्वज आयुध संख्यानेन पर बल ज्ञानम् ॥
When the enemy's army is marching through a path traversable by a single man, the commander (of the invader's army) should ascertain its strength by estimating the quantity of food-stuffs, grass, bedding, and other requisites, fire pots (agninidhána), flags and weapons.
english translation
eka ayana mArga prayAtasya senA nizcAra grAsa AhAra zayyA prastAra agni nidhAna dhvaja Ayudha saMkhyAnena para bala jJAnam ॥
hk transliteration by Sanscript