Swiftly, and as silently as possible, their work was performed. The watchman, from the place where he was bound, could not see, but he could hear, and he knew they were at work with drills, blow-pipes, wedges, and the other implements of the burglar’s trade. Hour after hour passed, the watchman, bound and gagged, being guarded by his vigilant keeper. In telling the story subsequently, he said he was civilly treated by the man who guarded him. At his request the cords that held his arms were loosened, and the gag in his mouth was placed where it would least inconvenience him. Whenever he complained of thirst, his keeper gave him a glass of water from a pitcher in the room. An hour or so before daylight the robbers opened the safe, and secured their plunder. Hastily packing it into the bags that had contained their tools, they departed, leaving their tools behind, and leaving the watchman securely fastened in his chair. He was ordered not to stir for an hour: bound as he was, he could not stir until some one came to his assistance, so that the parting injunction of the thieves was entirely superfluous. The amount of their plunder was never positively made known to the public, but was understood to be not less than two hundred thousand dollars—a very fair compensation for the work of a single night. [Sidenote: THE OCEAN BANK ROBBERY.] Of the many successful bank robberies that have taken place on this continent, the Ocean Bank burglary ranks among the foremost for its ingenuity and skill, and for being a complete puzzle to the most experienced detectives of the city of New York. Although an investigation by the police authorities was begun within a few hours after the discovery of the robbery, no clew was ever obtained, or, at any rate, given to the public, of the perpetrators; and to this day the whole matter has been involved in mystery, and probably will ever remain so. The maxim of war, that the reduction of every place, however strong, is possible, must be equally true in the art of thievery. It is evident that no vault can be made impregnable; no lock can be contrived by human ingenuity, with all its mechanical appliances, that will prove superior to other human ingenuity; no system of watching can make property entirely safe against the patience and acuteness of men who give good faculties to the science of stealing. The premises occupied by the Ocean Bank were at the corner of Greenwich and Fulton Streets, New York, a locality much frequented by day and night. One would imagine that an attempt at robbery in this locality must be detected very quickly, provided the policemen and the watchers employed around the neighboring stores performed their duty. The robbery occurred between one and three o’clock on the morning of the 28th of June, 1869. It appears that there was no regular inside watchman employed by the bank, but they had an out-door man employed to watch the premises.