'For Us' in the Bible

Now when Joshua was near Jericho, lifting up his eyes he saw a man in front of him, with his sword uncovered in his hand: and Joshua went up to him and said, Are you for us or against us?

And Joshua said, O Lord God, why have you taken us over Jordan only to give us up into the hands of the Amorites for our destruction? If only it had been enough for us to keep on the other side of Jordan!

And the children of Joseph said, The hill-country is not enough for us: and all the Canaanites living in the valley have iron war-carriages, those in Beth-shean and its towns as well as those in the valley of Jezreel.