... last week. The train last evening brought intelligence of no change in the position of the Yankees at the White House or Tunstall's. Their cavalry are encamped on a hill near Tunstall's. Col. Shingler 's men are picketing as far down as Diascund, and to within a short distance of Tunstall's. The general impression seems to be that Keyes will attempt a march around Richmond to Aquia Creek or t...