Scholars have paid much attention to the Northern and Southern Armies in the Western Han but there are fewer studies of the establishment and duties of officials subordinated to the central regular armies, such as the Palace Garrison (weiwei 衛尉) and the Chamberlain for the Imperial Insignia (zhongwei 中尉). This essay focuses on the establishment of lingzhang-type subordinates of the zhongwei and on the duties of the Royal Artisans (sigong 寺工) and Water Patrol offices (duchuan 都船) to examine aspects of the development of the zhongwei, utilizing the chapter on state offices (“Baiguan gongqing biao” 百官公卿表) in the Hanshu, the “Salary Regulations” (zhilü 秩律) in the “Legal Text of Year 2” bamboo slips, and other relevant materials.
The main duties of the sigong and the wuku 武庫, subordinated to the Chamberlain for the Palace Revenues (shaofu 少府) in the early Han, were respectively weapons production and storage. Under Emperors Jing and Wu, due to a noticeable increase in military demands coming with the threat from princedoms and from the steppe federation of the Xiongnu, military administration concerned with production and storage of weapons became more important and complex, and the sigong and wuku came to be subordinated under the Chamberlain for the Imperial Insignia. This development also reflects the rationalization of the central government and the increasing significance of official administrative agencies during the Western Han.
Like the sigong, the duchuan was inherited from the Qin. Judging from the main responsibilities of the Chamberlain for the Imperial Insignia, the duchuan was probably in charge of security of waterways around the metropolitan region of the capital. Furthermore, in order to support material transport by water in the early Han, the duchuan was additionally responsible for the manufacture and allocation of official boats, and further participated in delivering grain to the Guanzhong region by water. Three aides and the prison of duchuan were established, perhaps in relation to these core and extended duties. Therefore, although duchuan, like the zhonglei 中壘, is not listed in the “Salary Regulations,” it was more likely established early in the Han.
Compared to tunwei-type subordinates of the zhongwei, lingzhang-type subordinates developed later, in the reigns of Emperors Jing and Wu. This shows that the administrative mechanism of the central regular armies had become more prominent than it was in the early Han. Moreover, the three commandants of the metropolitan region of the capital (sanfu duwei 三輔都尉) were fully established in the reform of the civil service system in 104 BCE, making administration of the capital more similar to that of local government. This can shed light on the significance of the renaming of zhongwei to zhijinwu 執金吾. It also leads us to think about how military systems were transformed into ordinary administrative agencies, and how research on bureaucratic institutions can be advanced by investigating the interaction between bureaucratic organization and administrative developments.