... hast thou seen amore valiant knight than I in all the known world; hast thou read inhistory of any who has or had higher mettle in attack... 
Miguel de Cervantes 「The History of Don Quixote, Vol. I, Complete」
...“He is an honest and a mettle gentleman, and I would have ye bear in mind who says it...
Robert Louis Stevenson 「Kidnapped」
...On inquiry he wasinformed that, during his absence, the female, who had been anxious totry the mettle of the pony, had mounted it, and that the animal hadset off at full speed...
Edward Jesse 「Anecdotes of Dogs」
...All had arms of a uniform pattern, and horses swift and full of mettle, of which the worst was worth a hundred livres...
Chretien DeTroyes 「Four Arthurian Romances」
...—The ground was sandy, and several gullies descending tothe river occasioned difficulties which tried the mettle of our horses, andconvinced me that we now carried too much weight for them...
Thomas Mitchell 「Journal of an Expedition into the Interior of Tropical Australia」
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