Note 137 — Chapter X · CAMPAIGN OF KHALID IN IRAC. A.H. XII. A.D. 633.
Reading edition
The distance must have been over 300 miles, besides the detour rendered necessary by the intervening desert (the Nefûd of red sand, see Lady Blount’s Pilgrimage to Nejd); and must have taken, C. de Perceval says, not less than ten days; with any other than Khâlid, I should have said a good deal more.