Each boat carried a gun running on slides, and upon the proper service of these guns depended a good deal of the success of the expedition.

They had been rowing steadily on for above half an hour, when suddenly from their left a bright line of light cut the black darkness of the forest, and was followed by a sharp report.

For a moment the course of the boats was checked, and one was directed to pull in and see who the enemy might be, but directly after there was another report a couple of hundred yards higher up, and then another, and another.

“Catch a weasel asleep,” said Lieutenant Johnson, grimly; “that signal will run right up to the prahus. We’ve got to deal with some one who has his wits about him.”

So indeed it proved; for a quarter of an hour later, as they still pushed steadily on in line, there came a warning from the first boat in the shape of a dull heavy report, and the other boats sheered out of the right line, ready to deliver their own fire.

For plainly enough, though wearing a grey shadowy appearance, a couple of prahus could be seen coming swiftly down the stream, the long rows of oars on either side beating the water with a wonderfully regular stroke, and sending them along at quite a startling rate.

Shot after shot was fired, but with what effect the occupants of the boats could not tell, for no heed was paid to the firing, save that the prahus seemed to increase their speed, and were steered so as to run down the enemy that tried to check their way.

It was a matter of little more than a minute from the first sighting of the vessels, each of which was five or six times the size of the largest boats, and their disappearance round the point below, with the water foaming behind them, and the English boats in full pursuit. Several shots had been fired, for each boat found its opportunity at last, and the firing was kept up till the enemy had gone.

The attempt to overtake them was, however, felt to be hopeless, for the prahus went at least two yards to the boats’ one; all the officers could hope was, that one of the shots had done irreparable mischief, or that, warned by the firing, the steamer would sink them as they passed.

More they could not have done; for to have remained still was to have been sunk, the prahus dashing down at a fearful rate, and evidently seeking a collision; so, angry and disappointed, the pursuit was kept up, every ear being attent for the first shot sent at the enemy’s boats by the steamer; but they waited in vain, for when at last they came within challenging distance, it was to find that no prahus had been seen.