After a side track to (re)apply for membership to the Fighters, Mages, and Undaunted (dungeon delver) guilds, it was time to defend Davon's Watch - Not that the city needed help - the Dunmer warmage and region general, Tanval was here and he summoned a flaming bone golem, called "a brother of Strife", who simply cannon balled out to the Covenant fleet and destroyed most of them.
A few ships managed to dock further up the coastline but dealing with them was not as bad as dealing with the now rampaging Strife golem who was happily destroying the rest of Stonefalls - not because the scamp summoning pussy was hard to beat. Getting up to the part where you can rebind him was the tough part.
Good thing he's not a walking cheat code when I fight him!
Once re-imprisoned in his volcano we could then focus on the main Covenant general who moonlights as a necromancer. He wasn't very hard either, especially when he transformed into a more hideous but weaker form. The douche somehow still managed to kill Tanval's son in the battle which enraged the war mage - causing him to depart and summon the second brother of Strife because anger clouds judgment. Sigh. This one was a lot tougher and only when Tanval realized his error did he sacrifice himself so that the monster could be sealed like its brother.
With that the Covenant advance was halted in the most "shoot your own foot" method possible.