'For Us' in the Bible

It happened after the death of Joshua, the children of Israel asked of the LORD, saying, "Who should go up for us first against the Canaanites, to fight against them?"

The children of Israel arose, and went up to Bethel, and asked counsel of God; and they said, "Who shall go up for us first to battle against the children of Benjamin?" The LORD said, "Judah first."