The Orcs are in the Deep !
Isildur was marching north along the east banks of the River , and near the Gladden Fields he was waylaid by the Orcs of the Mountains, and almost all his folk were slain. He leaped into the waters, but the Ring slipped from his finger as he swam, and then the Orcs saw him and killed him with arrows.
There are older and fouler things than Orcs in the deep places of the world.
Orcs will often pursue foes for many leagues into the plain, if they have a fallen captain to avenge.
You must dig swift and deep, if you wish to hide from Orcs.
Orcs were as keen as hounds on a scent, it was said, but they could also climb.
It was dark, but not too dark for the night-eyes of Orcs.
Orcs travel fast.
Enemies of the Orcs are likely to be our friends.
'Surely even Orcs must pause on the march?' said Gimli. 'Seldom will Orcs journey in the open under the sun, yet these have done so,' said Legolas. 'Certainly they will not rest by night.'
Let the Orcs come as thick as summer-moths round a candle!
Orcs came with axes and cut down my trees.
'I wonder when we'll find water again?' said Sam. 'But I suppose even over there they drink? Orcs drink, don't they?' 'Yes, they drink,' said Frodo. 'But do not let us speak of that. Such drink is not for us.'
Trolls are only counterfeits, made by the Enemy in the Great Darkness, in mockery of Ents, as Orcs were of Elves.
'The Orcs have run before us, as if the very whips of Sauron were behind them.'