[32] Sir Lucas Pepys was physician in ordinary to the King, and seven years President of the College of Physicians. He had a seat at Mickleham, in Surrey. One day, at Dorking, he inquired at a druggist's what all his varieties of drugs were for. "To prepare prescriptions," was the reply. "Why," said Sir Lucas, "I never used but three or four articles in all my practice."
This distinguished man, in the Peninsular War, was the most admirable spy ever attached to an army. He would assume the character of Spaniards of every degree and station, so as to deceive the most acute. He gave the most reliable and valuable information to Lord Wellington, and on one occasion he was entrusted by his Lordship with a very particular mission, which he undertook effectually to perform, and to return on a particular day with the information required. Just after leaving the camp, however, he was taken prisoner, before he had time to exchange his uniform: a troop of dragoons intercepted him, and carried him off; and the commanding officers desired two soldiers to keep a strict watch over him and carry him to head-quarters. He was, of course, disarmed, and being placed on a horse, was galloped off by his guards. He slept one night in the kitchen of a small inn; conversation flowed on very glibly, and as he appeared a stupid Englishman, who could not understand a word of French or of Spanish, he was allowed to listen, and thus obtained precisely the intelligence he was in search of. The following morning, being again mounted, he overheard a conversation between his guards, who deliberately agreed to rob him, and shoot him at a mill where they were to stop, and to report to their officer that they had been compelled to fire at him in consequence of his attempt to escape.
Shortly before their arrival at the mill, the dragoons took from their prisoner his watch and his purse, lest they might meet with some one who would insist on having a portion of the spoil. On reaching the mill, they dismounted, and to give appearance of truth to their story, they went into the house, leaving their prisoner outside, in the hope that he would make some attempt to escape. In an instant, Waters threw his cloak upon a neighbouring olive-bush, and mounted his cocked hat on the top. Some empty flour sacks lay upon the ground, and a horse laden with well-filled flour-sacks stood at the door. Sir John contrived to enter one of the empty sacks, and throw himself across the horse. When the soldiers came out of the house, they fired their carbines at the supposed prisoner, and galloped off.