Last of all came the two infernal ships, swaying unsteadily with the current; the pilots of course, as they neared the bridge, having noiselessly effected their escape in the skiffs. The slight fire upon the deck scarcely illuminated the dark phantom-like hulls. Both were carried by the current clear of the raft, which, by a great error of judgment, as it now appeared, on the part of the builders, had only been made to protect the floating portion of the bridge. The 'Fortune' came first, staggering inside the raft, and then lurching clumsily against the dyke, and grounding near Kalloo, without touching the bridge. There was a moment's pause of expectation. At last the slow match upon the deck burned out, and there was a faint and partial explosion, by which little or no damage was produced...