Read the passage from Ivanhoe.On the other hand, many other knights, both English and Norman, natives and strangers, took part against the challengers, the more readily that the opposite band was to be led by so distinguished a champion as the Disinherited Knight had approved himself.

Here, “approved himself” means the Disinherited Knight had proved his ability as a champion. The other knights were especially willing to compete because the opposing side would be led by someone who had shown he could succeed in battle. So “is successful in battle” is the best choice.

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