'For Us' in the Bible

And it will be in Joshua's being by Jericho, and he will lift up his eyes and will see, and behold, a man standing before him and his sword drawn in his hand; and Joshua will go to him and say to him, Art thou for us or for our adversaries?

Was the iniquity of Peor little for us, which we were not cleansed from it till this day, and there will be a smiting in the assembly of Jehovah?