Let them.

I shall not stop away for them." The boy flushed, and ignoring the fact that he was about to commit a trespass, he slipped off shoes and hose, waded straight across the shallow river, and sat down on the other side to dry his feet, and put on hose and shoes again.
And all the time he felt a strong desire to glance up and down the river, to see if he had been observed by any one; but in his pride of heart he would not, for fear that he would be seen watching, and some one connected with his family's enemies take it for a sign of fear.
This done, he rose, gave his feet a stamp, glanced up at the face of the cliff, to see one of the parent ravens fly off, uttering an angry croak; and then he began to bear off to the right, so as to ascend the low part of the cliff, reaching the top quite five hundred yards away, and turning at once to continue his ascent by walking along the edge, which rose steeply, till it reached the point above the raven's nest, and then sloped down into a hollow, to rise once more into the wooded eminence which was crowned by Cliff Castle, the Darleys' home.
"They've a deal better place than we," said Mark to himself, as he strode on, in full defiance of the possibility of being seen, though it was hardly likely, a great patch of mighty beech-trees, mingled with firs, lying between the top of the big cliff and the Darleys' dwelling.
"More trees, and facing toward the west and south, with the river below them, while our home is treeless and bare, and looks to the north and east, and is often covered with snow when their side's sunny and bright.
My word! warm work, climbing up here, and the grass is as slippery as if it had been polished.

Mustn't go over.

Father wouldn't like it if I were to be killed; but I shouldn't be, for I should come down in the tree-tops, and then fall from bough to bough into the river, and it's deep just under the raven's nest." Thinking this, he went on, up and up, cautiously, clear of head as one who had from childhood played about the cliffs, and reaching the summit breathless, to stand on the extreme verge, watching one of the ravens, which came sailing up, saw him at a distance, rose above his head, and then began to circle round, uttering hoarse cries.
"Ah, thief!" cried the lad; "I see what you have in your beak.

A chicken; but your tricks are at an end.