Seven...

...is the number of letters you will have to rearrange to solve today's Brain Bender. Ready??

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What two words formed from different arrangements of the same seven letters, can be used to complete the sentence below?

I was trying hard to __________ the history of the famous __________ of the Crimean War.

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Well, alrighty then. Seven it is! And like always, the answers will be found in the comments later.