in any case , the expression 'green elves ' , coupled with the fact that it was the green- elves of ossiriand whom beren led to the ambush of the dwarves at sarn athrad in the later story ( the silmarillion p. 235 ) , shows which elvish people they were to become , even though there is as yet no trace of ossiriand beyond the river gelion and the story of the origin of the laiquendi ( ibid .