The Custom House opposite quickly ignited, and the inflammable nature of its contents caused the fire to assume enormous proportions. Meanwhile the bombardment was kept up, the forts on shore still replying with regularity, steadiness, and precision, and the armoured coast train of the 1st Sussex Artillery Volunteers, under Captain Brigden, rendering excellent service. In one of the forts a man was standing in front of a small camera-obscura, on the glass of which were a number of mysterious marks. This glass reflected the water and the ships; and as he stood by calmly with his hand upon a keyboard, he watched the reflections of the hostile vessels moving backwards and forwards over the glass. Suddenly he saw a French gunboat, after a series of smartly-executed manoeuvres, steaming straight over one of the marks, and, quick as lightning, his finger pressed one of the electric keys. A terrific explosion followed, and a column of green water shot up at the same instant. The gunboat _Lavel_ had been suddenly blown almost out of the water by a submarine mine! Broken portions of her black hull turned over and sank, and mangled remains of what a second before had been a crew of enthusiastic Frenchmen floated for a few moments on the surface, then disappeared. Not a soul on board escaped. Along the telegraph line from the signal-station on Beachy Head news of the blowing up of the enemy's gunboat was flashed to London, and when, an hour later, it appeared in the newspapers, the people went half mad with excitement. Alas, how they miscalculated the relative strength of the opposing forces! They were unaware that our Channel Fleet, our Coastguard Squadron, and our Reserve were steaming away, leaving our southern shores _practically unprotected_! CHAPTER VI. LANDING OF THE FRENCH IN SUSSEX. The Briton is, alas! too prone to underrate his adversary. It is this national egotism, this fatal over-confidence, that has led to most of the reverses we have sustained in recent wars. The popular belief that one Briton is as good as half a dozen foreigners, is a fallacy which ought to be at once expunged from the minds of every one. The improved and altered conditions under which international hostilities are carried on nowadays scarcely even admit of a hand-to-hand encounter, and the engines of destruction designed by other European Powers being quite as perfect as our own, tact and cunning have now taken the place of pluck and perseverance. The strong arm avails but little in modern warfare; strategy is everything.