Sentence:  Hitherto I have been but the witness, little more; and I should hardly think now to take another tone, that of your <WSD>coadjutor</WSD>, for the time, did I not perceive in you,—at the crisis too—a troubled hesitancy, proceeding, I doubt not, from the clash of military duty with moral scruple—scruple vitalized by compassion. 
Meaning of the word marked with <WSD> tags:  An assistant or helper.