The Japanese leaders proceeded with deliberation and caution. They had the enemy penned up with no hope of reenforcement, and nothing was to be gained by haste or the unnecessary waste of men and equipment. On September 19, 1914, to facilitate the movement of their troops behind the beleaguered city, they seized the railway connecting Tsing-tau with the Chinese province of Shantung, and China, prompted by Berlin, protested against the act as a violation of neutrality. This was the second Chinese protest, the first having been sent to Tokyo after the Japanese made their first landing on Chinese territory at Lung-chow. To the former objection Japan had no answer except to set forth that the landing was a military necessity and made with no intention of permanent occupancy. To the second protest, however, she replied without hesitation that possession of the railway line was justified since it was owned by Germans. The wide area covered by the Japanese investment campaign is shown by the fact that by September 13, 1914, they had established guards at the railway station of Kiao-chau--a town having the same name as the whole German concession--twenty-two miles distant from Tsing-tau.
While the Japanese infantry and engineers waited for the floods the naval airmen were not idle. The first damage inside the city was inflicted by two seaplanes which dropped bombs upon the railway station and barracks. Although one of the planes was hit several times by the German guns, both made a safe return. This raid was the forerunner of a systematic air campaign, designed as much to strike terror and discouragement into the hearts of the garrison and the civil population as to gain any military end by the actual destruction of defense works. Bombs were dropped also upon ships in the harbor. Occasionally the Japanese flyers scattered circulars calling upon the defenders to surrender and pointing out the uselessness of further resistance.
The first serious losses on either side were naval. On August 28, 1914, two days after the first bombardment a typhoon swept the Japanese fleet, causing havoc among the little destroyers and sending one to the bottom. Five days later another destroyer ran aground in Kiao-chau Bay. A German merchant ship in the harbor was set afire by the Japanese aerial bombs and destroyed. The greatest naval losses suffered during the whole engagement were the destruction of the Austrian cruiser _Kaiserin Elizabeth_ and of the Japanese cruiser _Takachiho_. The _Kaiserin Elizabeth_ was sunk by the naval bombardment; but the loss of the _Takachiho_ was due to the German torpedo boat _S-90_.