Red Eve by H. Rider Haggard

For a while Hugh and Eve heard nothing, but Grey Dick's ears were sharper than theirs, quick as these might be. About half a minute later, however, they caught the sound of horses' hoofs ringing on the hard earth, followed by that of voices and the crackle of breaking reeds.

Two of the speakers appeared and pulled up their horses near by in a dry hollow that lay between them and the river bank. Peeping between the reeds that grew about the mouth of the earth-dwelling, Eve saw them.