Question

why did the traveller knock at the door

Answer 1

The traveler knocked at the door for he wanted to meet somebody there with whom he seemed to have promised to come perhaps after along gap of time.

The travelers on smiting at the door but nobody answered the door.

Also when the travelers leaves, the horse makes the very real, physical ''sound of iron on the stone''.

We are told very title about the travelers, we also know very title about the events prior to the traveler arriving at the house, and we are left eager to know what happens once the travelers have left.   ''once the plunging hoofs were gone''

Answer 2

The traveller knocked at the door because he wanted to come inside the house And to meet somebody there with whom he seemed to promised to come