When the work on the canal through the peninsula had approached its completion, and the huge iron scoop of the dredging machine had commenced demolishing the barrier which intervened between the bed of the canal and the “Father of Waters,” an unforeseen occurrence, which could not be guarded against, crushed the enterprise. Owing to heavy rains and the rapid rise of the Mississippi above and opposite Vicksburg, the head of the canal gave way, and the water poured in at a tremendous rate. The force of the current, however, did not break the dam near the mouth of the canal, but caused a crevasse on the western side, through which the water flowed in such profusion as to inundate the lower part of the peninsula to the depth of four or five feet. When the fracture occurred a number of soldiers were on the levee, and were thrown into the torrent, but no lives were lost. All attempts to repair the mischief proved ineffectual, and the troops were removed to Milliken’s Bend, fifteen miles above. * * * * * On the 27th of February, Admiral Porter dispatched what was called a dummy Monitor, to run the Vicksburg batteries, in order to ascertain their exact location. This contrivance was an old flatboat, with flour-barrels for smoke stacks, and a couple of large hogsheads to represent Monitor turrets. It ran the fortifications in gallant style, and drew the fire of the rebel guns, without creating a suspicion of the true character of the vessel. The rebel authorities, fearful of the capture of the Indianola, then in an exposed position undergoing repairs, caused that vessel to be blown up to prevent her from falling into the hands of the Federals, and thus uselessly sacrificed the finest iron-clad they had on the western waters. The prudent forethought of General Grant exhibited by his employing a portion of his men in cutting channels from the Mississippi to Providence lake on the west side, and to Moon lake on the east side, was now made apparent, and those works were progressing rapidly.