Somewhat late in the evening, Captain Douglas, who, it may be remembered, had the command of one of the Northumbrian regiments, informed General Forster that a spy had been arrested, but the general was so much engrossed by Mrs. Scarisbrick that he paid no attention to the information. Captain Douglas then spoke to Brigadier Mackintosh, who at once went with him to a small room where the man was detained.
Meantime, the spy had been recognised as Ralph Fairbrother, for whose capture a reward had been offered, and who was supposed to have gone to General Carpenter at Newcastle. On being searched a letter was found on him addressed to General Wills, giving particulars of the exact state of the forces, and making some remarks on Forster's incompetency. The letter bore no signature, but was in a female hand. A few lines, traced in pencil, had evidently been added at the ball, and this important postscript recommended an immediate attack of the town, stating that it must be successful, since Forster was unprepared.
After reading this letter, and considering it for a moment, the brigadier handed it to Captain Douglas, who likewise read it carefully.
“Can ye guess by whom it is written?” inquired Mackintosh in a low tone.
“I can,” replied the other.
“Hark ye, sirrah!” said Mackintosh to the prisoner, who was looking on anxiously, “if you desire to save your life, you will tell us who wrote this letter, and from whom you received it.”
“It was slipped into my hand,” replied the spy. “That is all I know about it.”
“Were you not engaged by a lady to convey it to General Wills? Answer plainly.”
“I betray no confidences,” replied Fairbrother, firmly.
“Is General Wills at Wigan?” demanded Captain Douglas. “And how many regiments of infantry, horse, and dragoons, has he got with him?”