The Ivory Child by H. Rider Haggard

Now I, Allan Quatermain, come to the story of what was, perhaps, one of the strangest of all the adventures which have befallen me in the course of a life that so far can scarcely be called tame or humdrum.

Amongst many other things it tells of the war against the Black Kendah people and the death of Jana, their elephant god. Often since then I have wondered if this creature was or was not anything more than a mere gigantic beast of the forest. It seems improbable, even impossible, but the reader of future days may judge of this matter for himself.