Jiangnan Shipyard
Ordered by the government of the Qing dynasty in 1910 under the deal signed between the Qing navy minister Zaixun, his deputy admiral Sa Zhenbing and the Japanese, the first two ships "Yongfeng" (永丰) and "Yongxiang" (永翔) were built by Japan, and the second pair "Yongjian" (永健) and "Yongji" (永绩) were built by Jiangnan Shipyard in China with technical help from Japan. All four ships differed slightly from one another.