The arrogant declarations of a conquering king reveal a leader who believes he possesses absolute military superiority, capable of overcoming any natural or artificial obstacle. Through vivid imagery of controlling water sources, he boasts of his unprecedented success in capturing heavily fortified targets. He first highlights his ability to find water in the most unexpected places, claiming to have dug deep into the earth to uncover hidden springs that were previously completely unknown [רש״י, רד״ק]. The primary approach among commentators understands this as a metaphor for absolute triumph. Just as a person digs a well, strikes water, and drinks, this ruler initiates every campaign and brings it to a flawlessly successful conclusion [רש״י, מצודת דוד].
The nature of these newly discovered waters is understood in various ways. Some view them as resources belonging to other nations [ביאור שטיינזלץ] or simply as powerful, flowing streams [מצודת ציון]. Metaphorically, this represents the conquest of fierce strongholds that no one ever believed could fall, just as no one imagined finding drinking water in barren, arid landscapes [רלב״ג]. Beyond the metaphor, there is a practical military explanation. The king's army was supposedly so massive that the normal surface groundwater of the land was entirely insufficient. To survive, he was forced to dig deep into the earth to tap into new water sources [רד״ק]. A less likely perspective suggests these boasts were a direct response to King Hezekiah's defensive strategy of stopping up the local springs [רלב״ג].
The king then shifts to his ability to eliminate the water defenses of his enemies. Fortified cities often relied on surrounding rivers or deep, water-filled moats to block an invading army. Yet, the conqueror claims that overcoming these obstacles is his constant, everyday method of operation [רש״י]. He boasts that his armies are so unimaginably vast that the mere drinking of his soldiers and their animals, along with the trampling of their feet, is enough to completely drain these protective barriers [רש״י, מצודת דוד, ביאור שטיינזלץ]. This devastation is achieved with profound ease, requiring nothing more than the footsteps of his marching troops [רלב״ג]. Alternatively, this boast might be an extreme exaggeration directed at Egypt, with the king claiming he possesses the power to dry up even the mighty Egyptian river [רד״ק].