खनकाकाशयोधिभ्यः खनकेभ्यो भूमिलाभः श्रेयान् ॥ कZ_०७.१०.३६ ॥
khanakākāśayodhibhyaḥ khanakebhyo bhūmilābhaḥ śreyān
खनकाकाशयोधिभ्यः खनकेभ्यः भूमिलाभः श्रेयान्।
Because engineering methods (tunneling, undermining, breaching) convert effort into durable territorial control and positional advantage, not merely momentary assault success.