Kautilya's Arthashastra 2.33.10

2.33.10

svabhūmiṃ yuddhakālaṃ pratyanīkam abhinnabhedanaṃ bhinnasaṃdhānaṃ saṃhatabhedanaṃ bhinnavadhaṃ durgavadhaṃ yātrākālaṃ ca paśyet //

He shall also know what kind of ground is more advantageous to his own army, what time is more favourable, what the strength of the enemy is, how to sow dissension in an enemy's army of united mind, how to collect his own scattered forces, how to scatter the compact body of an enemy's army, how to assail a fortress, and when to make a general advance.