Late in the year, another group of four European-built cruisers arrived, further strengthening the fleet and necessitating extensive maneuvers in 1888 to familiarize the crews with the rest of the fleet. The Beiyang Fleet adopted the same black, white, and buff paint scheme used by the Royal Navy at the time, repainting their vessels at some point in 1888. In 1889, the fleet was divided into two divisions; Dingyuan and several cruisers were sent on a tour of Korean ports while Zhenyuan and the rest of the fleet remained in the Bohai Sea for exercises. The two divisions rendezvoused in Shanghai in December, thereafter proceeding to Hong Kong for Zhenyuan and Dingyuan to be drydocked. They then cruised off Korea. Another visit to Japan came in June and July 1891; the fleet stopped in Kobe on 30 June and Yokohama on 14 July. At the latter port, a large Japanese delegation of senior military commanders and members of the imperial family received the ships. Another voyage to Japan took place the following year. Coupled with the Nagasaki Incident, these voyages contributed to the growing tensions between China and Japan, since Hongzhang intended them to make clear Chinese naval strength at a time the Japanese fleet was small and poorly developed. At the core of the dispute was control over Korea, which since the Convention of Tientsin of 1884, was treated as a co-protectorate of China and Japan. First Sino-Japanese War In early 1894, the Donghak Peasant Revolution broke out in Korea, prompting China to send an expedition of 28,000 to suppress the rebels. Japan viewed this as a violation of the Tientsin Convention and deployed 8,000 troops in response, leading to the outbreak of the First Sino-Japanese War on 1 August. The Chinese fleet was no match for the new Combined Fleet of Japan, as years of insufficient naval budgets had not allowed Hongzhang to update the vessels—funds he had planned to use to add new quick-firing guns to Zhenyuan and Dingyuan were instead appropriated for the 60th birthday of the Dowager Empress Cixi—and the Chinese lacked effective commanders and sufficiently trained crews. And to add to China's disadvantages during the war, the Japanese had broken the Chinese diplomatic codes in 1888, giving them access to China's internal communications. As the Chinese made preparations in August for action, they removed the gun shields from the main battery turrets. Experience at