And you looked in that day to the weapons in the Palace of the Forest; you saw that the City of David had many breaches in its defenses; you stored up water in the Lower Pool. You counted the buildings in Jerusalem & tore down houses to strengthen the wall. You built a reservoir between the two walls for the water of the Old Pool, but you did not look to the One who made it, or have regard for the One who planned it long ago.
The leaders of Judah did all that they could to prepare for war, but did not do the one thing they should. They got weapons, checked the walls & stored up water, but all their work was pointless because they never asked God for help. Each of the steps they took were important & even wise, but they should have started by asking God to guide their work.
In Isaiah 20:2 we read:
At that time the Lord spoke through Isaiah son of Amoz. He said to him, “Take off the sackcloth from your body & the sandals from your feet.” And he did so, going around stripped & barefoot.