Final answer:
In the given sentence, the correct word to fill in the blank is 'knight', as it fits with the context of a warrior looking dashing in armour.
Step-by-step explanation:
In the sentence: 'The ___ looked dashing in his armour,' the correct answer is 'knight'. The term 'knight' refers to a medieval warrior, often depicted wearing armour. The provided information refers to the qualities of the knight, mentioning how he was ambitious in warfare, which further supports the use of 'knight'. On the other hand, 'night' refers to the period from sunset to sunrise when there is no sunlight, which doesn't fit the context of the sentence.
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