John Codman Ropes,
The Campaign of Waterloo: A Military History
“ No doubt, the occupation of any point or points on the line by which two allied armies communicate with each other tends to embarrass them, to hinder any combined movements, and to delay their union; but to direct the march of an invading army 15merely to compass this end, when it is possible to defeat one of these opposing armies by engaging it where it cannot be supported by its ally, is to miss the opportunity of the campaign. ”
