Crossword puzzle clue "it's tested in battles"

Here are the possible solutions for it's tested in battles clue

Answer
Clue
Relevancy
mettle
Clue
It's tested in battles
Definition
spirit or courage
adcampaign
Clue
Series of battles within the last two millennia?
adwars
Clue
Mac-PC battles, e.g.
airwar
Clue
High-flying battles
Battles with bombers
aisne
Clue
Scene of four major W.W. I battles
French river, scene of four W.W. I battles
French river that was the site of three WWI battles

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