They were four Guantanamo marines, officially known for the time as signalmen, and it was their duty to lie in the trenches of Camp McCalla, that faced the water, and, by day, signal the _Marblehead_ with a flag and, by night, signal the _Marblehead_ with lanterns. It was my good fortune--at that time I considered it my bad fortune, indeed--to be with them on two of the nights when a wild storm of fighting was pealing about the hill; and, of all the actions of the war, none were so hard on the nerves, none strained courage so near the panic point, as those swift nights in Camp McCalla. With a thousand rifles rattling; with the field-guns booming in your ears; with the diabolic Colt automatics clacking; with the roar of the _Marblehead_ coming from the bay, and, last, with Mauser bullets sneering always in the air a few inches over one's head, and with this enduring from dusk to dawn, it is extremely doubtful if any one who was there will be able to forget it easily. The noise; the impenetrable darkness; the knowledge from the sound of the bullets that the enemy was on three sides of the camp; the infrequent bloody stumbling and death of some man with whom, perhaps, one had messed two hours previous; the weariness of the body, and the more terrible weariness of the mind, at the endlessness of the thing, made it wonderful that at least some of the men did not come out of it with their nerves hopelessly in shreds. But, as this interesting ceremony proceeded in the darkness, it was necessary for the signal squad to coolly take and send messages. Captain McCalla always participated in the defence of the camp by raking the woods on two of its sides with the guns of the _Marblehead_. Moreover, he was the senior officer present, and he wanted to know what was happening. All night long the crews of the ships in the bay would stare sleeplessly into the blackness toward the roaring hill. The signal squad had an old cracker-box placed on top of the trench. When not signalling they hid the lanterns in this-box; but as soon as an order to send a message was received, it became necessary for one of the men to stand up and expose the lights. And then--oh, my eye--how the guerillas hidden in the gulf of night would turn loose at those yellow gleams! Signalling in this way is done by letting one lantern remain stationary--on top of the cracker-box, in this case--and moving the other over to the left and right and so on in the regular gestures of the wig-wagging code. It is a very simple system of night communication, but one can see that it presents rare possibilities when used in front of an enemy who, a few hundred yards away, is overjoyed at sighting so definite a mark.