Hosokawa Katsumoto vs Ly Thuong Kiet

Hosokawa Katsumoto was appointed kanrei (deputy shogun) under Shogun Ashikaga Yoshimasa. He became a central figure in the shogunate's politics during a period of declining central authority and rising daimyo power.

Katsumoto's forces clashed with Yamana Sozen's army in Kyoto, sparking the Onin War. The conflict began with street battles in the capital and quickly engulfed the entire country, leading to widespread destruction and the collapse of central authority.

Katsumoto backed Shogun Yoshimasa's brother Yoshimi as successor, while Yamana Sozen supported Yoshimasa's son Yoshihisa. This succession dispute escalated into armed conflict, drawing most daimyo into opposing camps.

Katsumoto died of illness in 1473 while the Onin War was still raging. His death, along with Yamana Sozen's death the same year, removed the main protagonists but the war continued for another four years under their successors.

Ly Thuong Kiet led a preemptive invasion of Song China, attacking border regions to disrupt a planned Song invasion of Vietnam. His forces captured several cities and destroyed military supplies. The campaign delayed the Song invasion and demonstrated Vietnamese military capability.

Ly Thuong Kiet commanded Vietnamese forces to a decisive victory over a Song Chinese invasion at the Nhu Nguyet River. He used a fortified defensive line and a famous poem to boost morale. The victory forced the Song to negotiate peace and recognize Vietnamese sovereignty.

Ly Thuong Kiet implemented administrative reforms to strengthen the central government and standardize laws. He also oversaw the construction of irrigation systems and roads. These reforms improved governance and economic productivity in the Ly dynasty.