Sentence:  We saw the last Campaign that an Army of Fourscore Thousand of the best Troops in "Europe", with the Duke of "Marlborough" at the <WSD>Head</WSD> of them, cou'd do nothing against an Enemy that were too numerous to be assaulted in their Camps, or attack'd in their Strong Holds. 
Meaning of the word marked with <WSD> tags:  The place of honour, or of command; the most important or foremost position; the front.