Finrod Felagund led an army of reinforcements from Nargothrond .
Finrod Felagund was ambushed by Morgoth 's forces at the Fens of Serech and cut off from the bulk of his troops .
Finrod Felagund led an army of reinforcements from Nargothrond , but was ambushed by Morgoth 's forces at the Fens of Serech and cut off from the bulk of his troops .