The men set to work, and the boys helped to stow the sail and fasten it with the tiers. Suddenly there was a sharp puff of wind. It lasted a few seconds only, then Joe Chambers pointed towards the spot whence a hazy light seemed to come. "Here it comes," he said. "Do you see that line of white water. That is a squall and no mistake. I am glad we are not under sail." There was a sharp, hissing sound as the line of white water approached them, and then the squall struck them with such force and fury that the lads instinctively grasped at the shrouds. The mizzen had brought the craft in a moment head-to-wind, and Joe Chambers and the two sailors at once lowered it and stowed it away. "Only put a couple of tiers on," the skipper shouted. "We may have to upsail again if this goes on." The sea got up with great rapidity, and a few minutes after the squall had struck them the _Susan_ was beginning to pitch heavily. The wind increased in force, and seemed to scream rather than whistle in the rigging. "The sea is getting up fast!" Geoffrey shouted in the skipper's ear as he took his place close to him. "It won't be very heavy yet," Joe Chambers replied; "the sands break its force. But the tide has turned now, and as it makes over the sand there will be a tremendous sea here in no time; that is if this wind holds, and it seems to me that it is going to be an unusual gale altogether." "How long will it be before we can cross the Spit?" "We are not going to cross to-day, that's certain," the skipper said. "There will be a sea over those sands that would knock the life out of the strongest craft that ever floated. No, I shall wait here for another hour or two if I can, and then slip my cable and run for the Crouch. It is a narrow channel, and I never care about going into it after dark until there is water enough for a craft of our draught over the sands. It ain't night now, but it is well nigh as dark. There is no making out the bearings of the land, and we have got to trust to the perches the fishermen put up at the bends of the channel. However, we have got to try it. Our anchors would never hold here when the sea gets over the sands, and if they did they would pull her head under water." In half an hour a sea had got up that seemed to the boys tremendous. Dark as it was they could see in various directions tracts of white water where the waves broke wildly over the sands. The second anchor had been let go some time before. The two cables were as taut as iron bars, and the boat was pulling her bows under every sea. Joe Chambers dropped a lead-line overboard and watched it closely. "We are dragging our anchors," he said. "There is nothing for it but to run."