On the first day of May, 1915, announcement was made in Paris that experiments conducted at Issy les Molineaux over several months had brought about successful tests in firing a three-inch gun from an aeroplane. This had never been accomplished before, and had seemed a well-nigh impossible task. An entirely new piece was developed, firing a shell of about the same size as the regular 75-millimeter field gun. It was made lighter by half, with an effective range of 2,500 meters, considerably less than the standard gun.
French skill in designing weapons, always a trait of the race, was evidenced here. The heavy steel breechblock of the seventy-five was replaced by a wooden block. When fired the explosion of the powder charge automatically blew the wooden breechblock backward, thus neutralizing the shock. But owing to the open breech much of the powder's driving force was lost. Nothing to equal the new arm had there been up to that time. The wooden breechblock completely did away with the heavy hydraulic recoil cylinders which were one of the distinguishing features of the seventy-five. These cylinders were esteemed by many authorities to be the finest in the world, absorbing maximum shock with a minimum of effort.
The coming of this new gun marked a big step forward in aerial war and gave the French machines so equipped a decided advantage. Its effect was to make the German flyers more wary, avoiding combat except when impossible to avoid the issue. But its use was confined to the larger machines as a rule, particularly the Voisin biplane, the machine gun being favored by many airmen because of its lightness and the ease with which it could be handled.
The beginning of May, 1915, found aerial warfare in full progress again. The British defense squadrons showed somewhat better generalship and it was not until the tenth of the month that Zeppelins obtained any appreciable advantage in that quarter. But two of the raiders evaded the patrols on the night of May 10, 1915, and dropped bombs upon Westcliff-on-Sea, near Southend, at the mouth of the Thames, a bare twenty-five miles from London. There were no fatalities, but a man and his wife were badly burned when their home caught fire from a bursting bomb. At Leigh, near Southend, several shops were burned. It was reported that four Zeppelins had been seen at Leigh, whereas Westcliff-on-Sea saw but two. If the larger number were correct it would indicate that the Germans were becoming more determined to reach London. One feature of the raid at Westcliff-on-Sea was that of sixty bombs dropped only a few struck in the town. Most of them fell on the beach and the sand neutralized any effects that the missiles might have had.
The Bull and George Hotel at Ramsgate was completely wrecked by bombs which struck it on the night of May 17, 1915. An instance of the vagaries of explosives was furnished by this raid. One of the bombs which struck the hotel penetrated the roof and fell upon a bed on which a woman was sleeping. It wrecked the room and tore a great hole in the floor through which the bed and occupant fell to the cellar. The sleeper was badly hurt and the bed practically uninjured. Fires started by other bombs in Ramsgate soon were extinguished.
Advices from Rotterdam stated that during this raid a Zeppelin fell into the Gierlesche Woods, Belgium, two men being hurt. The cause of the airship's plight was unknown, but the damage made it necessary that the frame be taken apart and sent to Germany for repairs.
One of the oddest combats of the war was staged on this day—May 17, 1915. A Zeppelin, flying from the direction of the English coast, was sighted in the channel by a French torpedo boat. The craft was at a comparatively low altitude and furnished an excellent mark. Only a few shots had been fired when it was seen to be in distress. The Zeppelin made several frantic efforts to rise, then fell into the sea within four miles of Gravelines. It sank before aid could be given the crew.
May 17, 1915, was a bad day for Zeppelins. One of the dirigibles supposed to have attacked Ramsgate early that morning was discovered off Nieuport, Belgium, by a squadron of eight British naval machines which had made a sortie from Dunkirk. They surrounded the enemy craft and three of the pilots succeeded in approaching close to the Zeppelin. Four bombs were dropped upon the airship from a height of 200 feet. A column of smoke arose. The Zeppelin looked as though it would fall for a moment, but righted itself and mounted to an altitude of some 11,000 feet, finally eluding its pursuers.
Two Zeppelins and two Taubes were caught by daylight after a frustrated raid upon Calais on May 18, 1915. They were fired upon from many points. A battery at Gris Nez succeeded in hitting one of the dirigibles. The other craft of the flotilla stood by their injured fellow as long as they dared, but made off after a few minutes, as French machines were closing in from all sides. The injured Zeppelin dropped on the beach near Fort Mardick, about two miles from Dunkirk. Forty men aboard were taken prisoners, including several officers.
Two women in Southend, England, met death on May 27, 1915, when Zeppelins visited that city. A child was badly injured. The lighting plant and several industrial establishments suffered damage. Repeated attacks on Southend had resulted in the installation of searchlights and the detailing of more aviators to guard its citizens. Neither availed to prevent the loss of life, but they did succeed in driving away the raiders after their first appearance.