Kaltschmidt and the Windsor explosions--The Port Huron tunnel--Werner Horn--Explosions embarrass the Embassy--Black Tom--The second Welland affair--Harry Newton--The damage done in three years--Waiter spies. In the check-book of the military attaché was a counterfoil betraying a payment of $1,000 made on March 27, 1915, to "W. von Igel (for A. Kaltschmidt, Detroit)." That stub was part of a bomb plot. A young German named Charles Francis Respa was employed in 1908 by Albert Carl Kaltschmidt in a Detroit machine shop. Seven years later Kaltschmidt had occasion to hire Respa again. To a group which included Respa, his brother-in-law Carl Schmidt, Gus Stevens and Kaltschmidt's own brother-in-law, Fritz Neef, he outlined a plan for destroying factories in Canada. Neef was the Detroit agent for the Eisemann magneto, and had a machine shop of his own. "We are not citizens of this country," Kaltschmidt reiterated to his accomplices. "It is our duty to stand by the Fatherland. The Americans would throw us out of work after war started." (The Americans, on the contrary, gave the ringleaders of the conspiracy plenty of hard labor after the war started.) To seal the bargain Kaltschmidt paid the men a retainer, and sent Stevens and Respa to Winnipeg to see whether it might not be feasible to blow up the railroad bridge there. Respa reported back. His next assignment was to go to Port Huron and determine whether enough dynamite might be attached to the rear of a passenger train bound through the international tunnel under the St. Clair River to destroy the tube. Respa came to the conclusion that it was not practicable, for the authorities were taking precautions against just such an operation. Respa and Stevens were then despatched to Duluth, where they met Schmidt and a fourth member of the group, each carrying a suitcase containing numerous sticks of dynamite, and the quartette returned with its explosives to Detroit. Kaltschmidt then hired him for $18 a week. Respa had left Germany before his term of military service came due; Kaltschmidt used this information as a club over his head, for he knew the young man could not return to the Fatherland. On June 21 Kaltschmidt called Respa to his office in the Kresge Building, and showed him two elaborate time-clock devices which could be so set as to fire bombs at any specified hour, and Respa, at Kaltschmidt's command, carried the clocks across the Detroit River to Windsor, Ontario, late that afternoon. His sister, Mrs. Schmidt, went with him, and together they wandered about until the hour when they knew that William Lefler, the night watchman of the Peabody Overall Company factory in Walkerville, would go on duty.