This continues the message from Yahweh given by Isaiah, the prophet, to King Hezekiah concerning King Sennacherib. It uses parallelism throughout. (See: [[rc://en/ta/man/translate/figs-parallelism]])
These boasts made by Sennacherib could only be fulfilled by his army. The pronoun "I" represents him and his army. (See: [[rc://en/ta/man/translate/figs-synecdoche]])
This is a boast that Sennacherib has so many soldiers that their feet dry up the water when they cross a river. This is an exagerration to emphasize the great number of soldiers he has. AT: "And by marching through the streams of Egypt, we dried them all up!" (See: [[rc://en/ta/man/translate/figs-hyperbole]])