She and Allan by H. Rider Haggard

Of our return to Kôr I need say nothing, except that in due course we reached that interesting ruin. The journey was chiefly remarkable for one thing, that on this occasion, I imagine for the first and last time in his life, Umslopogaas consented to be carried in a litter, at least for part of the way. He was, as I have said, unwounded, for the axe of his mighty foe had never once so much as touched his skin. What he suffered from was shock, a kind of collapse, since, although few would have thought it, this great and utterly fearless warrior was at bottom a nervous, highly-strung man.

It is only the nervous that climb the highest points of anything, and this is true of fights as of all others. That fearful fray with Rezu had been a great strain on the Zulu. As he put it himself, "the wizard had sucked the strength" out of him, especially when he found that owing to his armour he could not harm him in front, and owing to his cunning could not get at him behind. Then it was that he conceived the desperate expedient of leaping over his head and smiting backwards as he leapt, a trick, he told me, that he had once played years before when he was young, in order to break a shield ring and reach one who stood in its centre.