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Sink And Stay Sunk

Compatible with 1.9.*. Makes it so defeated fleets need to reach 90% strength before return to duty. (as opposed to 75%)
Not needed with VTM. (Integrated)
Can be installed mid-game.
Affects everyone, AIs included.
Works for all languages.
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Makes Naval Battles more impactful, and naval invasions less of a chore.

(1.8 upped the the requirement from 50% to 75%)