They had the full moonlight where they stood and the fire in the valley below was also a help.

He saw that the camp was made by a strong cavalry force.

Many of them were asleep in their blankets, but the others sat by the fire and seemed to be talking.
Then he passed the glasses to Dalton, who also, after looking long and well, passed them to Billy, as a right belonging to one who had been their real leader, and who shared equally with them their hardships and dangers.
"How large would you say that force is, George ?" asked Harry.
"Three or four hundred men at least.

There's a great bunch of horses.

I should judge, too, from the careless way they've camped, that they've no fear of being attacked.