That is called Poaching. It is also clearly unlawful under the terms of the Hunting Act as you did not have the permission of the landowner. The presence of a footpath means you have the right to pass and re-pass, nothing more, nothing less.
Perhaps worse is the irreparable damage actions like this do to legitimate lurcherwork/ferreting. A couple of my mates have permission around that area and there are some lads who PAY to shoot on certain farms in that valley. The fact that some people have spent over 20 years gaining the trust of landowners in the Dales who are now understandably sick