'For Us' in the Bible

Now after the death of Joshua it came to pass, that the children of Israel asked the LORD, saying, Who shall go up for us against the Canaanites first, to fight against them?

And it came to pass, when their hearts were merry, that they said, Call for Samson, that he may make sport for us. And they called for Samson out of the prison house; and he made sport for them: and they set him between the pillars.