The wise king that gathers (a knowledge of) his enemy through spies, can, putting forth a modicum of effort in conflict, neutralise (his exertions).
चारेण विदितः शत्रुः पण्डितैर्वसुधाधिपैः। युद्धे स्वल्पेन यत्नेन समासाद्य निरस्यते।२१।।