Any hope of resistance was centered on two young princes, Emperor Gong's brothers. The older boy, Zhao Shi, who was nine years old, was declared emperor on June 14, 1276, in Fuzhou. The court sought refuge in Quanzhou, seeking an alliance with the Superintendent of Maritime Shipping, the Muslim Pu Shougeng. However, he secretly formed an alliance with Kublai, so the Song court was forced to flee in 1277. The court then sought refuge in Silvermine Bay (Mui Wo) on Lantau Island. The older brother became ill and died on May 8, 1278 at age ten, and was succeeded by his younger brother who became Emperor Huaizong of Song, aged seven. The Sung Wong Toi monument in Kowloon commemorates his enthronement. On March 19, 1279 the Song army was defeated in its last battle, the Battle of Yamen, fought against the Yuan army led by the Chinese general Zhang Hongfan in the Pearl River Delta. Song Prime Minister Lu Xiufu is said to have taken the boy emperor in his arms and jumped from his sinking ship into the sea, drowning both of them.