The financial drain of the Imjin War in Korea against the Japanese was one of the many problems – fiscal or other – facing Ming China during the reign of the Wanli Emperor (1572–1620). In the beginning of his reign, Wanli surrounded himself with able advisors and made a conscientious effort to handle state affairs. His Grand Secretary Zhang Juzheng (1572–82) built up an effective network of alliances with senior officials. However, there was no one after him skilled enough to maintain the stability of these alliances; officials soon banded together in opposing political factions. Over time Wanli grew tired of court affairs and frequent political quarreling amongst his ministers, preferring to stay behind the walls of the Forbidden City and out of his officials' sight. Scholar-officials lost prominence in administration as eunuchs became intermediaries between the aloof emperor and his officials; any senior official who wanted to discuss state matters had to persuade powerful eunuchs with a bribe simply to have his demands or message relayed to the emperor. The Bozhou rebellion by the Chiefdom of Bozhou was going on in southwestern China at the same time as the Imjin War.