Question

How do you know that they knew that the order to charge was a mistake ? (The charge of the light brade)​

Answer 1

Explanation:

The speaker notes “the soldier knew / someone had blundered.” In other words, the order to charge is a mistake, a lapse in judgment—and the “soldier” knows this, even if his commander doesn't. One might expect the cavalry to object to the order, since it is a “blunder” which will get them all killed.