Gives an interesting start, bit of a cliffhanger. Also leaves me wanting to know more about the dwarven captives; find out if, and why, they'd be good for ransom.
Your descriptions were done well too; picturing the captors took no effort thanks to your details.
There were a few minor spelling/grammar errors, little things like the "His arms and felt stiff" which is probably just a missing word or something like that. Just little things though.
Looking forward to seeing more parts of the story!