Prinsloo withdrew with his Free Staters across the border, but was persuaded by Delarey, who had fallen back on Graspan about eight miles N.E. of Belmont, to rejoin him; and a favourable position was occupied on a group of kopjes astride the railway, where on November 25 another battle was fought, in which the Naval Brigade suffered a loss of nearly half its strength. The enemy, though driven back, retreated in good order, as at Belmont two days previously, there being no cavalry available for effective pursuit. Methuen pushed on to Witkoplaagte. The Boers were greatly discouraged by Belmont and Graspan, where, as at Talana and Elandslaagte, they had been ejected from strong kopje positions chosen by themselves. The moral was not lost upon Delarey, who determined to try whether a better stand could not be made in a river position, and selected the junction of the Modder and the Riet for the experiment. His idea was not so much to dispute the passage of the river as to use the deep channels as covered ways and as natural trenches from which the plain could be grazed by rifle fire. The Modder after approaching the Riet changes its direction abruptly three tunes above the junction, enclosing a diamond-shaped area which provided the Boers with a ready-made perimeter camp. [Sidenote: Map. p. 59.] Methuen, thinking that the enemy would as before select the good kopje position which offered itself on Spytfontein halfway to Kimberley, determined to diverge from the railway with the greater part of his army and circling through Jacobsdaal, Brown's Drift and Abon's Dam to attack Spytfontein in flank, where he had little doubt that he would find the Boers in position; but Modder River, which he was inclined to believe was only held as an advanced post, must first be taken. Delarey had been joined by P. Cronje, who unperceived by Methuen's cavalry came in with a body of Transvaalers from Mafeking, and was in occupation of the loop between the rivers. At sunrise on November 28 Methuen advanced from his camp at Witkoplaagte six miles south of the river. The fight began under misapprehensions on each side. Methuen believed that only the river bank above the railway bridge was held in force; while he was credited by his opponents with the intention of crossing the Riet River by Bosnian's Drift of which he did not know the existence.