That is called backstory.
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The Past Perfect expresses the idea that something occurred before another action in the past. It can also show that something happened before a specific time in the past.
This is not one tense but the combination of two tenses. Past perfect and past simple are used to show an action in the past that happened before another past action.I arrived at the station. -- past simpleThe train had left. -- past perfectWhen I arrived at the station the train had left.
To fight a decisive fleet action from the battle-line. It only happened once with steel battleships, at Tsushima in 1905 (never before, nor never since).
War has always been a part of human history, even before the dawn of civilization. As a result, there was no "time before war".
The past perfect tense.