When all hands upon both sides were mustered it was found that we had gained possession of the battery without the least injury to either side.  The French officer was then directed to march his men--who were of course disarmed--to the village which I had seen earlier in the morning, and which we now learned was called Erquy; and as soon as they were fairly out of the battery the magazine was broken open, the powder barrels rolled together in the middle of the room, the heads knocked out, and a train laid from barrel to barrel, while another party of our men was busily engaged in bringing the six spiked guns together in a cluster immediately over the magazine.  A quarter-of-an-hour sufficed to complete these preparations, when one end of a long fuse was buried in one of the barrels of powder, the remainder of the fuse being carried as far as it would go across the paved yard.  The men then fell in and, under my command, marched out of the yard and took the way along the cliffs toward the boats, while Mr Adair and the gunner remained behind to fire the fuse and ensure the destruction of the battery.  We had been gone about ten minutes, and had almost reached the spot where we were to make our descent to the beach, when the earth shook and jarred violently beneath our feet, a dull, heavy _boom_ burst upon the morning silence, a fierce gust of wind suddenly swept over us, and, looking back, we saw an enormous dim-coloured cloud, heavily charged with hurtling debris, dismounted cannon, and masses of shattered brick-work, hovering over the spot where the battery had been.  Two minutes later the first luff and the gunner, breathless and panting, came running up to us, and we all plunged down the cliff-face together.  The boat-keepers, seeing us coming, headed the boats in toward the beach; and within another five minutes we were once more afloat and pulling quietly alongshore toward the mouth of the bay, intently watching, meanwhile, for some indication of the whereabouts of the other division.  We had not long to wait, for we had scarcely pulled a quarter of a mile when the battery on the other headland blew up; and presently the yawl and second cutter came into view from behind the point, pulling hard for the mouth of the bay.