Despite being advised that he would be in danger if he went against the company, on 11 May requested that all coastal regents pledge their allegiance to him. He did the same for the members of his court on 13 May. However, several leaders, including second in line to the throne Prince Ngabehi Loringpasar, 's elder brother Prince Tepasana, and his mother Queen Amangkurat, were against a revolution; Captain Johannes van Velsen, Dutch resident in Kartasura, reported to Visscher that the Sunan had been persuaded against rebelling. However, became increasingly certain that he would join forces with the Chinese. On 23 May, the approximately 1,000 Chinese left Tanjung and headed east, assaulting the 15-man Juwana outpost, as well as the one in Rembang. Although the Dutch resident and five others escaped, the Dutch recorded a high number of casualties, with reports of cannibalism. The resident in Demak, hearing these rumours and with 3,000 Chinese outside the walls, requested permission to withdraw to Semarang. Considering Demak key to the defence of the city, Visscher refused, instead sending 80 to 100 native troops as reinforcements. The resident of Demak was eventually called back to Semarang, leaving the defence of the fort to Mertopuro. Rembang fell on 27 July, with Jepara falling four days later. The Chinese from Tanjung soon reached Semarang and laid siege, assisted by the troops previously sent to destroy them. Visscher, fearing that his troops would not be enough, requested reinforcements from . agreed to send an artillery unit, but it was secretly intended to reinforce the Chinese. With expeditions from the Chinese and Javanese reaching the city walls, in early June Visscher ordered a retaliatory expedition, totalling 46 Europeans and 146 Indonesians and assisted by Javanese troops under the Governor of Semarang Dipati Sastrawijaya. This expedition was sent against the Chinese and Javanese gathering outside the hills of Bergota. Outside the walls, the Javanese soon deserted after spoiling the available artillery provisions, with the other native groups abandoning the expedition upon first contact with the Chinese. After killing several Chinese, the Dutch soldiers returned to the fortress. The following day, the Dutch commandeered all Chinese houses, including that of Anko. When working weapons and ammunition were found in his home, Anko stated that they were remnants from an earlier war in 1718.