Differential weathering happens when softer rocks weathers away and leaves harder, more resistant rock
behind
The phrase whether they would or not means that they were were tasked with the responsibility of carrying out the obligation against their will.
The phrase tells us that the Lords had no say on the tasks that they were asked to do. They were to accompany the rebels, they had no deciding power here.
This shows that their will has been taken from them. The person who is sending them on this errand has absolute power over them.
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