Unfinished Tales - J. R. R. Tolkien [219]
It was clearly seen in Rohan, when the true accounts of the battles at the Fords were known, that Saruman had given special orders that Théodred should at all costs be slain. At the first battle all his fiercest warriors were engaged in reckless assaults upon Théodred and his guard, disregarding other events of the battle, which might otherwise have resulted in a much more damaging defeat for the Rohirrim. When Théodred was at last slain Saruman’s commander (no doubt under orders) seemed satisfied for the time being, and Saruman made the mistake, fatal as it proved, of not immediately throwing in more forces and proceeding at once to a massive invasion of Westfold; 2 though the valour of Grim-bold and Elfhelm contributed to his delay. If the invasion of Westfold had begun five days earlier, there can be little doubt that the reinforcements from Edoras would never have come near Helm’s Deep, but would have been surrounded and overwhelmed in the open plain; if indeed Edoras had not itself been attacked and captured before the arrival of Gandalf. 3
It has been said that the valour of Grimbold and Elfhelm contributed to Saruman’s delay, which proved disastrous for him. The above account perhaps underestimates its importance.
The Isen came down swiftly from its sources above Isengard, but in the flat land of the Gap it became slow until it turned west; then it flowed on through country falling by long slopes down into the low-lying coast-lands of furthest Gondor and the Enedwaith, and it became deep and rapid. Just above this westward bend were the Fords of Isen. There the river was broad and shallow, passing in two arms about a large eyot, over a stony shelf covered with stones and pebbles brought down from the north. Only here, south of Isengard, was it possible for large forces, especially those heavily armed or mounted, to cross the river. Saruman thus had this advantage: he could send his troops down either side of the Isen and attack the Fords, if they were held against him, from both sides. Any force of his west of Isen could if necessary retreat upon Isengard. On the other hand, Théodred might send men across the Fords, either in sufficient strength to engage Saruman’s troops or to defend the western bridgehead; but if they were worsted, they would have no retreat except back over the Fords with the enemy at their heels, and possibly also awaiting them on the eastern bank. South and west along the Isen they had no way home, 4 unless they were provisioned for a long journey into Western Gondor.
Saruman’s attack was not unforeseen, but it came sooner than was expected. Théodred’s scouts had warned him of a mustering of troops before the Gates of Isengard, mainly (as it seemed) on the west side of Isen. He therefore manned the approaches, east and west, to the Fords with sturdy men on foot from the levies of Westfold. Leaving three companies of Riders, together with horse-herds and spare mounts, on the east bank, he himself passed over with the main strength of his cavalry: eight companies and a company of archers, intending to overthrow Saruman’s army before it was fully prepared.
But Saruman had not revealed his intentions