अहःसम्नाहपरिश्रान्तानपराह्नेऽभिहन्यात् ॥ कZ_१०.३.२१ ॥
ahaḥsamnāha-pariśrāntān aparāhne 'bhihanyāt
One should strike in the afternoon those exhausted by daytime preparations and marching readiness.
Readiness has daily peaks and troughs; attack when the opponent’s coordination and stamina are predictably lowest.