Beaver,
This sounds like a long, flat tale of a story.
Where are the pics?  especially right after the attack?
I was paddling the Hayes River in Manitoba years ago.  We were in a very nice camp that was used as a hunting/trapping camp by the Cree.  All night we heard the tail slapping and knew this was a hangout for a beaver family.  The next morning I wandered out of the tent and went down to the beach to check the canoe, which I pulled high on the land the night before, not wanting the beavers to chew up the wood thwarts and seats.  I stashed the paddles leaning against the tent for the same reason.
Next to the canoe was a pile of mud, a large pile which the beavers left to express their territory, I assume.  But no damage anywhere.
It is a good story but I think it is just a story.
Howard