About half an hour later the two Horses were summoned to the back of the house to eat something nice that the Hermit had got ready for them and Aravis, still walking and thinking, was startled by the harsh sound of a trumpet outside the gate.
There are no more uses of "summon" in the book.
Show samples from other sources
I was summoned to the principal’s office.
I summoned all my courage and walked into the room.