As I recall, the AI never makes amphibious invasions in STW v1.12. The player can refrain as well thus effectively eliminating them, which is how I always played the campaign. I am guilty of shinobi spamming. I was desperate.
Some players did claim that they could blitz the map and win in a short time, and IIRC there was a screen shot posted showing a quick win. I can't remember any of the details of how it was accomplished.
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