A pitched battle between Zeppelins, battle cruisers, and submarines on the German side, and destroyers, land batteries, aeroplanes and sea planes on the British side, took place in the morning of April 25, 1916, near Lowestoft. A number of aeroplanes and sea planes rose to attack the Zeppelins which were flying high and bound westward. In the course of the battle the airships turned toward the sea, bringing the pursuing aeroplanes within range of the naval guns. Four submarines also appeared on the surface and began firing their high-angle guns against the British aeros. One of the latter was destroyed by fire from a Zeppelin quick-firing gun, while two sea planes were severely damaged by the fire from the battle cruisers and submarines. May, 1916, began with three disasters for the German aerial forces. On the 3d of the month, the naval airship _L-20_ (Schuette-Lanz type) which had raided the coast of England and Scotland on the preceding day, ran out of fuel on the return trip and was carried by a strong wind eastward onto the Norwegian coast, where it stranded near Stavanger. The Norwegian authorities interned the crew and blew up the ship. Two more Zeppelins were lost two days later; the _L-7_ (one of the oldest airships in the service) was shot down by French warships off Saloniki, while the other fell a victim to the guns of a British squadron off the coast of Schleswig-Holstein. An Italian airship, the _M-3_, attempted a reconnoitering trip over the Austrian positions on the Gorizia front, but was heavily bombarded with incendiary shells. Fire broke out on the airship and the resulting explosion tore it apart, killing the crew of six men. Sixteen Allies' aeroplanes undertook a bombing expedition upon the German aerodromes at Mariakerke, dropping thirty-eight large and seventeen small bombs. A sea plane dropped one 100-pound bomb and two 65-pound bombs on the Solvay Works at Zeebrugge. All the machines are reported to have returned in safety, with one exception. Aerial combats increased in number and violence during the summer months, as many as thirty separate fights taking place in a single day on a short stretch of the battle fronts. In one of the combats, early in June, Lieutenant Immelmann, of the German forces, was shot down and killed. At first the report included his famous comrade, Lieutenant Boelke, among the killed, but news received later mentioned his name among the fighting corps. Dover and other ports on the English coast were raided by two German sea planes on June 9 and 10, 1916, according to the German official report. The British denied that any such raid took place. The next day, two German sea planes attacked Calais, on the French side of the Channel, dropping bombs on the port and the encampments. They returned to their base undamaged. German aeroplanes also raided Kantara, thirty miles south of Port Said, and fired on Romani with machine guns. A number of casualties occurred at Kantara.