February, 1915, was a bleak, drear month. Aviators of all the armies made daily scouting trips, but wasted little time in attacking each other. Few raids of importance took place on any of the fronts. But British airmen descended upon German positions in Belgium on several occasions. Zeebrugge, Ostend, and Blankenberghe received their attention in a half dozen visits between February 5 and 20. On February 16, 1915, a large fleet of aeroplanes, mostly British, swept along the Flanders coast, attacking defensive positions wherever sighted. At the same time, French airmen shelled the aeroplane center at Ghistelles, preventing the Germans from sending a squadron against the other flotilla. Paris, Dunkirk, and Calais glimpsed an occasional enemy aeroplane, but they were bent on watching troop movements and only a few stray bombs were dropped. The inactivity of the armies, burrowed in their winter quarters, was reflected in the air. It was announced by the French Foreign Office that from the beginning of hostilities up to February 1, 1915, French aircraft had made 10,000 reconnaissances, covering a total of more than 1,250,000 miles. This represented 18,000 hours spent in the air. Antwerp, which had surrendered to the Germans, was visited by British flyers on March 7, 1915. They bombarded the submarine plant at Hoboken, a suburb. The plant at this point had been quickly developed by the conquerors and the harbor served as a refuge for many undersea boats. Numerous attacks on ships off the Dutch mainland persuaded the British authorities that a blow at Hoboken would be a telling stroke against German submarines, and so the event proved. Several craft were sunk or badly damaged. Bombs set fire to the submarine works and much havoc was wrought among the material stored there. A number of employees were injured. The Antwerp populace cheered the airmen on their trip across the city and back to the British lines, for which a fine was imposed upon the city. During March, 1915, there was some activity in the East, where Zeppelins shelled Warsaw in Poland, killing fifty persons and causing many fires. One of the raiders was brought down on March 18, and her crew captured. The Russian service suffered losses, Berlin announcing the capture of six aeroplanes in a single week. One of these was of the Sikorsky type, a giant battle plane carrying a half dozen men.