Answer as below:
Though renowned by 19th century US generals for their tactical prowess and tenacity in battle,few people are now aware that the Apache had already established a fearsome military reputation after their successful 17th century attacks on the Spanish settlements ofSonora.
It is trying to establish a contrast in terms of some people knowing the reputation vs not. Hence something that makes the meaning clearer will be right
a) few people are now aware that the Apache had already
...
Though renowned by 19th century US generals for their tactical prowess and tenacity in battle,few people are now aware that the Apache had already established a fearsome military reputation after their successful 17th century attacks on the Spanish settlements ofSonora.
It is trying to establish a contrast in terms of some people knowing the reputation vs not. Hence something that makes the meaning clearer will be right
a) few people are now aware that the Apache had already
...
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