And now I could but guess what was happening in the channel, and watch the movements of the ship.  By the time that the last of the boats had disappeared, and I was free to again direct my attention to the larger craft, she had worked down the river as far as the entrance of the creek giving access to Olomba; and when she next hove about I soon saw, by the length of time that she was holding on the same tack, that she was making a long "leg" down the main channel of the river.  But she still had some ten miles of river to traverse before she would reach the spot at which it had been arranged that the boats should lie in ambush for her; and, fast as she was travelling, I estimated that it would take her at least an hour to cover that distance.  I therefore drew out my watch, noted the time, and then set myself patiently to await the course of events, keenly watching her movements meanwhile.  I noticed that, thanks to the exquisite cut of her canvas, she was looking well up into the wind, and I thought it possible that, with this advantage, she might perhaps reach the spot where the boats were awaiting her, without breaking tacks, which would be an advantage for our people, for it would throw her so close to the place of ambush that it would cause the attack almost to take the form of a surprise.  And so it did, as I afterward learned; for when at length her skipper was compelled to put his helm down and go about, in order to avoid grounding on the mud of the eastern bank of the river, the ship was in the very mouth of the creek wherein our boats were lurking; and while the ship was in stays, and all hands of her crew were busily engaged in tending the tacks, sheets, and braces, our people dashed alongside and took her almost without striking a blow.