How did limiting the power of generals later affect Song military strength?

To prevent the military usurpations that had plagued previous eras, the founder of the Song dynasty, Emperor Taizu, implemented policies that systematically weakened the power of military commanders. These measures included transferring the best troops to the capital, inducing powerful generals to retire, and subordinating military officers to civilian officials.12

While these reforms successfully established internal stability and prevented military coups, they ultimately hampered the dynasty's military effectiveness. By removing generals from their armies, concentrating strength in imperial units, and converting provincial forces into labor battalions, the Song government struggled to maintain a military prowess comparable to that of the Han or Tang dynasties. This policy of civilian control and the resulting military weakness left the Song vulnerable to foreign invaders, such as the Khitan and Xi Xia, and contributed to the dynasty's inability to break their power or expand its borders. Consequently, these safeguards against military ambition are widely considered to have hindered the Song armies in meeting the challenges posed by powerful foreign threats.12