अत्युष्णमल्पयवसेन्धनोदकं वा देशं हेमन्ते यायात् ॥ कZ_०९.१.३७ ॥
atyuṣṇam alpa-yavasa-indhana-udakaṃ vā deśaṃ hemante yāyāt
He should march in hemanta (early winter) against a region that is extremely hot or has scant fodder, fuel, and water.
It reduces attrition and supply burden by operating when heat stress and water demand are lower, improving endurance and control.