Legolas' keen eyes

Following with his keen eyes the trail to the river, and then the river back towards the forest, Aragorn saw a shadow on the distant green, a dark swift-moving blur. He cast himself upon the ground and listened again intently. But Legolas stood beside him, shading his bright elven-eyes with his long slender hand, and he saw not a shadow, nor a blur, but the small figures of horsemen, many horsemen, and the glint of morning on the tips of their spears was like the twinkle of minute stars beyond the edge of mortal sight. Far behind them a dark smoke rose in thin curling threads.

There was a silence in the empty fields, and Gimli could hear the air moving in the grass.

‘Riders!’ cried Aragorn, springing to his feet. ‘Many riders on swift steeds are coming towards us!’

‘Yes,’ said Legolas, ‘there are one hundred and five. Yellow is their hair, and bright are their spears. Their leader is very tall.’

Aragorn smiled. ‘Keen are the eyes of the Elves,’ he said.

‘Nay! The riders are little more than five leagues distant,’ said Legolas.

‘Five leagues or one,’ said Gimli, ‘we cannot escape them in this bare land. Shall we wait for them here or go on our way?’

‘We will wait,’ said Aragorn. ‘I am weary, and our hunt has failed. Or at least others were before us; for these horsemen are riding back down the orc-trail. We may get news from them.’

‘Or spears,’ said Gimli.

‘There are three empty saddles, but I see no hobbits,’ said Legolas.

The Two Towers, Book Three, Chapter 2: The Riders of Rohan.