No More Learning

From their black tents, long files of horse, they stream'd:
As when, some grey November morn, the files,
In           order spread, of long-neck'd cranes,
Stream over Casbin,[11] and the southern slopes 110
Of Elburz,[12] from the Aralian estuaries,[13]
Or some frore[14] Caspian reed-bed, southward bound
For the warm Persian sea-board: so they stream'd.