The terror of a massive invasion is often felt long before the first strike. The sheer scale of an approaching army overwhelms the senses with sight and sound, spreading destruction and fear before the actual battle even begins. As Nebuchadnezzar's vast cavalry advances, the countless horses kick up a thick cloud of dirt that completely blankets the city. While some view this overwhelming dust cloud as a dramatic exaggeration [רד״ק], others emphasize the literal magnitude of the force, noting that the sheer number of horses is so great that their dust alone is enough to cover the city entirely [מלבי״ם].
This visual terror is matched by a deafening roar. The heavy clatter of skilled horsemen and chariot wheels creates a noise so powerful that the city walls themselves begin to shake. This trembling can also be understood as an exaggerated description of the army's might [רד״ק]. However, another perspective suggests that the intense noise represents the absolute panic of the defenders. The sound of the approaching camp will strike such deep fear into the people that the resulting panic alone will lead to the collapse and cracking of the walls and towers [מלבי״ם].
When the moment of invasion finally arrives, the entry into the city is entirely effortless. The invading forces sweep through the gates as easily and quickly as if they were walking through the wide-open gaps of a city whose walls have already been broken down. Left completely helpless against the immense power of the invader, the city falls instantly, and the enemy takes control without facing any resistance or struggle [רד״ק].