Mbh 12.100.2c

A region that is overgrown with bushes and large trees and that is under water is fitted for elephant-warriors. A region that has many inaccessible spots, that is overgrown with large trees and topes of cane bushes, as also a mountainous or woody tract, is well-fitted for the operations of infantry. An army, O Bharata, which has a large infantry force, is regarded very strong. An army in which cars and horsemen predominate is regarded to be very effective in a clear (unrainy) day. An army, again, in which foot-soldiers and elephants predominate becomes effective in the rainy season. Having attended to these points (about the characters of the different kinds of forces and the manner of marching, quartering, and leading them), the king should turn his attention to the characteristics of place and time. That king, who having attended to all these considerations, sets out under a proper constellation and on an auspicious lunation, always succeeds in obtaining victory by properly leading his troops. No one should slay those that are asleep or thirsty or fatigued, or those whose accoutrements have fallen away, or one that has set his heart on final emancipation,[297] or one that is flying away, or one that is walking (unprepared) along a road, or one engaged in drinking or eating, or one that is mad, or one that is insane, or one that has been wounded mortally, or one that has been exceedingly weakened by his wounds, or one that is staying trustfully, or one that has begun any task without having been able to complete it,[298] or one that is skilled in some especial art (as mining, etc.), or one that is in grief, or one that goes out of the camp for procuring forage or fodder, or men who set up camps or are camp-followers, or those that wait at the gates of the king or of his ministers, or those that do menial services (unto the chiefs of the army), or those that are chiefs of such servants.