'Commander in chief' in the Bible

So the king of Assyria sent the commander in chief, the chief eunuch, and the {chief advisor} from Lachish to King Hezekiah at Jerusalem with a heavy army. They went up and came [to] Jerusalem, then they went up and came and stood at the aqueduct of the upper pool which is on the main road of the {washer's} field.

"Return to Hezekiah," he said, "and tell the Commander-in-Chief of my people: "This is what the LORD, the God of your ancestor David, says: "I've heard your prayer and I've observed your tears. Look! I'm healing you. Three days from now, you'll go visit the LORD's Temple.