Question About Leviathan: When did The Levi flooded West La Noscea

[Enkidoh]

Moose's quote from Merlywb specifically states that it was the Company of Heroes who destroyed Leviathan the first time. I recall there was further info mentioned about how they did so - they lured Leviathan into an inlet which they trapped him in with warships, then proceeded to pound him into submission with cannons, but I'm unsure of the specifics.

This is why the player needed the Whorleater to fight him - Leviathan was stated as not falling for the Company of Heroes' trick again and was learning from his defeat, thus he stayed out at sea and did not come close to shore, necessitating him being fought out in open water. I'll go looking through my screenshots and find the relevant into about it.

EDIT: okay, it seems there was no specific mention about cannons being brought to bear against him, but there was mention (by Y'shtola) about the Company of Heroes trapping Leviathan in an inlet where his power over the sea was diminished:

Y'shtola: "The Company of Heroes defeated Leviathan having first lured him into an inlet, but we must needs contend with him upon the open sea. It will avail us little to consult past experience."

This is further elaborated on a short time later by Eynzahr:

Eynzahr Slafyrsyn: "By all accounts, Leviathan's most formidable weapon is the very sea itself. Waves and whirlpools, tides and currents-all these things are his to command. The key to victory, I believe, lies in disarming our foe."
Eynzahr Slafyrsyn: "This, in effect, is what the Company of Heroes achieved with their ruse."

So basically, the Company of Heroes trapped Leviathan in an inlet where his water aspected power of the ocean was sapped from him, allowing them to fight him and destroy him. How they did this is not clear (I presumed they fired cannons at him until he was destroyed, but it's more likely in hindsight, that they used the way they dealt with Titan), but the fact remained they did succeed in destroying him. Not for long though as it turned out (to Halfstone's sad chagrin).