All along the boat a clatter and ring of metal on metal told of preparation for firing. Amidships a hiss and splutter of air showed that the beam tubes were flooding, till a spurt of water coincided with a sharp cry of "Tubes full, sir!" The Captain spoke into the voice-pipe at his side, and the ticking sound from the main motors rose to a steady hum. He lowered the periscope till the eyepiece was level with the deck, and stood drumming his fingers against the hoisting wires. The matter of seeing the tubes cleared away and of keeping the boat's trim right lay now with his officers. His head was to be concerned only with the attack and the shot. He alone would be to blame for a miss now, and he had too well-trained a staff for him to need to worry over any diving details during an attack. His brain was working outside the boat in the early sunshine, where a big and confident U-boat was bound out for her station in the Irish Sea. The enemy was heading straight at him, and he himself was crossing her bow from port to starboard, heading north. To get his bow tubes to bear meant a quick rush to the north to get to a fair range, and then a turn to port till his head was south and the enemy ran across his sights. He was, in view of the glassy state of the sea, keeping his periscope out of sight as long as possible, and intended to keep the instrument lowered till, on his estimate of the U-boat's course and speed (gauged in his first rapid glance) and his submarine sixth sense, he had turned inwards from a point on his target's starboard bow. In sixty-five seconds from the first sighting of the enemy, peace and quiet reigned again in the E boat. Except for the occasional slight hiss and gurgle as a tube-vent was tested, there was no sign to tell that the whole boat was on a tiptoe of expectant emotion. Three minutes from his first order to increase speed he starboarded his helm and--still with his periscope lowered--began his turn through west to south. His hands fidgeted now on the taut hoisting wires before him, and every nerve in his body cried for a glance at the enemy just to check his mental estimate. His first glance when his turn was half through would show him whether he had judged rightly, or whether he had made a miscalculation which would be heavy on his soul till the end of his days. But his nerves were well in hand and his will strong; the repeater of the gyroscopic compass had ticked slowly round under his gaze until it showed 275°--a trifle north of west. Then the periscope rose with a sigh and a creak of straining wires. He stooped and pressed his eye to the instrument as it rose, waiting for the very earliest glimpse of the upper world. All along the boat the men leaned from their stations to watch, for they knew exactly what depended on the quick decision based on that first glimpse he had taken. To his eye the green flickering circle lightened, paled, and then changed to a clear pale-blue sky and a sparkling stretch of sea.