There are Orcs, very many of them, ' he said. 'And some are large and evil: Black Uruks of Mordor... but there is something else... A great cave-troll, I think, or more than one. There is no hope for escape.'
...
Through the braced and splintered door, a huge arm and shoulder with green scales was thrust. Boromir leaped forward and hewed with all his might, but his sword rang and glanced aside, and fell from his shaken hand