I have seen this quote on reddit a few times and around the internet:

"Perhaps it was the spirit of the time and the place that affected me. But I assure you no occurrence of any of my other battlefields impressed me so keenly. I halted on my tour to gaze on the spectacle, and to reflect on its meaning. This soldier, I realized, must have had friends at home and in his regiment; yet he lay there deserted by all except his dog. . . . I had looked on, unmoved, at battles which decided the future of nations. Tearless, I had given orders which brought death to thousands.

Yet, here I was stirred, profoundly stirred, stirred to tears. And by what? By the grief of one dog. I am certain that at that instant I felt more ready than at any other time to show mercy toward a suppliant foe-man. I could understand just then the tinge of mercy which led Achilles to yield the corpse of his enemy, Hector, to the weeping Priam."

It's quite a powerful image, however, I've never actually seen a proper citation attached to it. I was curious if anyone knows if this is a real quote or one of the stories that gets passed around as fact.