From: "A Sense of Obligation"

By Harry Harrison.

"The launcher had been juryrigged from a ship's jump-space generator, that was obvious. The generator and its controls were neatly cased and mounted. Cables ran from them to a roughly constructed cage of woven metal straps, hammered and bent into shape by hand. Three technicians were working on the equipment. Brion wondered what sort of bloodthirsty war-lovers the magter hadn found to handle the bombing for them. Then he saw the chains around their necks and the bloody wounds on their backs. He still found it difficult to have any pity for them. They had been obviously willing to accept money to destroy another planet---or they wouldn't be working here."

1961.