The New Zealand Railways Magazine, Volume 3, Issue 2 (June 1, 1928)
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Just beyond Mercer as we go southward the Teoteo Range, a high ridge of clay, drops abruptly to the slow Whangamarino Creek, which here joins the Waikato on its right (east) side. Above us there, commanding the Whangamarino and the main river, there was a British redoubt. Here a Royal Artillery officer was stationed with two field guns.