…in his journeys which he constantly makes through different parts of the world; he is here to-day, to-morrow in France, and the next day in Potosi; and the best of it is the said horse neither eats nor sleeps nor wears out shoes, and goes at an ambling pace through the air without wings, so that he whom he has mounted upon him can carry a cup full of water in his hand without spilling a drop, so smoothly and easily does he go, for which reason the fair Magalona enjoyed riding him…
There are no more uses of "amble" in the book.
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The elderly couple likes to amble along the beach at sunset.
A toothless old man came ambling up to them,
J.K. Rowling -- Harry Potter and the Sorcerer’s Stone