Not circumstantial evidence, but _fact_.

Signed on one side by R.E.Lee and, on the other, by Colonel Morrison." He laughed shortly over the futility of argument under such circumstances.

"Do you presume to contest this, _too_ ?" To his amazement the young officer facing him bowed easily and smiled in turn.
"I _do_.Emphatically._No pass_ was given Herbert Cary either by Colonel Morrison _or_ General Lee." "_What ?_" cried the General angrily.
Harris only pointed.
"Read it, sir--if you please." He watched till Grant's eyes started to scan the pass again, and then repeated the words which he knew so well.
"Pass _Virginia Cary_ and escort through Federal--and Confederate lines." "'Virginia Cary,' General, is a non-combatant and a child.

'Escort' may mean a single person--or it may mean a whole troop of cavalry." To his infinite relief and joy his Commanding General looked up at him thoughtfully, then slowly rose from his desk and took a turn about the room, followed by a faint blue trail of cigar smoke.

He paused.
"And what does _Cary_ say ?" he asked.
Again Harris smiled the quiet smile of the lawyer who has been confronted with such questions before and knows well how to answer them.
"He, too, is on trial for his life.