You carefully pilot your ship into harbour at the top of the tide. You wait until the tide goes out and there is clear ground around the ship. Then you bring the horse and a cart to offload into. The cargo is heavy – coal, or slag, so you harness two horses in tandem to haul the load across the beach and up to the stores.
(Click on image to enlarge)
You can offload earlier, before the tide is fully out, if you can lean against the quay
You have a small set of stables, and you are as proud of your horses as you are of your ship.
One horse in particular stands out and does most of the work.