"the valiant" is correct and usable in written English.
You can use it when describing someone who is brave, courageous, or heroic. Example: The valiant soldier fearlessly charged into battle, determined to protect his fellow comrades.
Exact(58)
That's the valiant Aussie quality".
You fought the valiant fight.
The valiant losers got a big hand.
Where "Tomorrow" sometimes sprawls, "Only the Valiant" is tightly constrained.
Where are the valiant Americans with power and position?
We love and respect your father, Gene, the valiant Marine.
But Langewiesche makes a convincing case for the valiant A320.
So what if Sally (the valiant Ms. Pearthree) never married.
The valiant days of the Left Book Club were over.
"Give the valiant losers a hand, folks," he said.
When youthful and frisky, Albert Einstein would refer to himself as "the valiant Swabian," quoting the poem by Ludwig Uhland: "But the valiant Swabian is not afraid".
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com