5th Dunlending Armoured Division, Front and Center!

[alatar]

But a great many of the Hillmen had given themselves up, and they were afraid, and cried for mercy. The Men of the Mark took their weapons from them and set them to work.

"Help now to repair the evil in which you have joined," said Erkenbrand. "And afterwards you shall take an oath never again to pass the Fords of Isen in arms, nor to march with the enemies of Men. And then you shall go free, back to your land. For you have been deluded by Saruman. Many of you got death as a reward for your trust in him, but had you conquered, little better would your wages be."

The Men of Dunland were amazed. For Saruman had told them that the Men of Rohan were cruel and burned their captives alive.

Following the victory of the Rohirrim at Battle at Helm's Deep in the Third Age, King Théoden magnanimously allows the Dunlendings to leave in peace after they help clean the place up a bit.

Now, would this act have changed any of the hearts of these men, making them want to join up against the Enemies of Men?

These were presumably tough fighters, even if ill equipped, as they had to train and fight beside the Uruks of Saruman. Maybe (or not) none rode off to the battle down at Mundburg, but is it possible that they helped later against the invasion of Rohan?

Would Sauron cared that these men had once been in the sway of Saruman? And would the Dunlendings have realized that they needed to stand up against the Darkness?