Koshamain's War vs Battle of the Ten Kings (Dāśarājñá)

The Ainu forces adhered rigidly to traditional tribal warfare doctrines; their inflexible, leader-centric command structure prevented any adaptation or alternative strategy after Koshamain's death. In contrast, the Wajin forces, under Kakizaki Sueshige and Takeda Nobuhiro, exhibited flexible posture including the transition from defense to offense, rapidly adapting to changing combat conditions and exploiting the enemy's vulnerability.

Faced with a numerical disadvantage, the Bharata command adopted a dynamic and asymmetric maneuver doctrine instead of a static defense. By using the terrain and water as a weapon, combined with the mobility of chariot/mounted troops, they adapted to the changing battle conditions with excellent flexibility. The confederation, however, remained stuck in a traditional, numbers-based frontal assault doctrine and could show no flexibility against the unexpected situation.

Attrition War — Rationale: Rather than a classic war of annihilation where both sides aim for total destruction, Koshamain's War was a conflict where the resource-poor Ainu forces attempted quick gains through a surprise offensive, while the Wajin suppressed them through defense and counteroffensive, wearing down the enemy. The Wajin succeeded in depleting Ainu logistics by prolonging the war, ultimately delivering the final blow through leadership targeting.

Battle of Annihilation

Neither side concentrated forces on a single center of gravity, but rather targeted the enemy's dispersed defense system. For the Ainu, the center of gravity was the simultaneous attack on ten forts to shatter the Wajin defense. For the Wajin, the main center of gravity emerged as the rallying point of surviving defenders and Koshamain's main Ainu force; Takeda Nobuhiro directed his entire crew toward this point, seeking a decisive outcome.

Sudas directed his center of gravity (Schwerpunkt) at the dyke on the Ravi River, a key geographical point that would break the enemy's numerical superiority. By breaching the dyke, the enemy's center of resistance was struck at its heart, and the course of the battle changed instantly. In contrast, the confederation dispersed its center of gravity across the entire front, failing to either grasp the dyke's importance or mass its forces at a critical point.

No distinct military deception or ruse strategy is recorded in the conflict. The Ainu offensive relied entirely on surprise and numerical superiority, while the Wajin defense relied on fortification and technological superiority. Although Takeda Nobuhiro's leadership targeting can be considered a strategic ruse, it remained more of a tactical opportunism.

The dyke-breach maneuver is one of the earliest and most effective ruses in military history. Sudas did not turn the river into a simple obstacle, but used it as a controlled flood weapon, taking the confederation completely by surprise. The enemy could neither detect nor tactically foresee such a deception. This is a classic example of transforming an intelligence advantage into tactical deception.

Wajin forces held an advantage in firepower based on the range and armor-penetration superiority of iron-tipped arrows. At the Battle of Nanaehama, Takeda Nobuhiro's personal bow shots targeting the Ainu command echelon created a sudden psychological shock in the enemy ranks, catalyzing the break of resistance. The Ainu side lacked similar organized firepower to create a shock effect; their successes relied more on surprise and close combat.

In a pre-gunpowder era, the shock effect achieved by the Bharatas was created by an artificial flood via the dyke breach, physically and psychologically stunning the enemy. The chariot and infantry assault, combined with the chaos caused by the flood, led to an irreversible collapse of the confederation's lines. This can be assessed as an irregular ruse of war synchronized with the maneuver.

The mountainous and forested terrain of the Oshima Peninsula provided a natural advantage to the Ainu warriors as their traditional habitat, offering favorable ground for ambush and hit-and-run tactics. Conversely, Wajin forces turned the terrain to their advantage by constructing twelve fortified castles (Dōnan Jūni-tate), utilizing these fortifications for defensive warfare. The summer months (May 1457) when the battles occurred allowed operations for both sides, but achieving a result before winter conditions set in became a logistical necessity for the Wajin.

The key factor determining the battle's outcome was the use of terrain and water. The Ravi River was turned into a natural ally for the Bharatas. By crossing the river and breaching the dyke, they harnessed the destructive power of water as a weapon. The confederation was not only caught in the difficult terrain obstacle of a river crossing, but also failed to anticipate a possible flood, completely losing the balance of 'Heaven and Earth' to their opponents.

It is evident that in the initial phase of the uprising, Ainu forces possessed detailed intelligence on the locations of Wajin forts and their defensive vulnerabilities, enabling them to achieve significant territorial gains quickly through raid-style attacks. The Wajin side initially suffered from an intelligence deficit, but over time activated reconnaissance and informant networks to identify Koshamain's leadership position, reversing the information asymmetry necessary for a decisive counterstrike. Consequently, intelligence superiority shifted from the Ainu in the first phase to the Wajin in the second.

Vasistha, by knowing both the rival priest Vishvamitra and the inner dynamics of the opposing tribes, perfectly applied the principle of 'know your enemy'. The detailed mockeries in the hymns indicate a deep understanding of the confederation's weaknesses. In contrast, the confederation was unaware of Sudas's unconventional tactical plan to breach the dyke, and the intelligence asymmetry worked completely in favor of the Bharatas.

At the war's outset, Ainu forces achieved a high operational tempo by leveraging interior lines and intimate terrain knowledge, swiftly targeting ten different forts. The Wajin, however, were delayed in regrouping their initially dispersed forces, but resisted at the two remaining fortified sites to slow the enemy, and assembled a counteroffensive force under Takeda Nobuhiro. At the Battle of Nanaehama, the Wajin seized the maneuver initiative by executing a rapid concentrated counterattack.

The Bharata forces, under a single command and in accordance with the principle of interior lines, quickly maneuvered to the dyke area after crossing the river. The confederation's scattered and uncoordinated advance prevented them from responding to this rapid maneuver. Sudas correctly established his center of gravity at the dyke, trapped the enemy on the exterior lines, and fully seized the maneuver advantage.

Ainu warrior motivation was extremely high due to territorial invasion, unfair trade, and the killing of a compatriot; this psychological factor explains the initial speed and ferocity of their successes. Wajin settlers, conversely, displayed defensive tenacity driven by survival instinct and feudal loyalty. Within the framework of Clausewitz's 'friction,' the leadership vacuum and morale collapse on the Ainu side following Koshamain's death constituted the war's climactic moment; the tribes, having lost the will to fight, dispersed and ended the conflict.

For the Bharata troops, the battle was a sacred mission with their god Indra directly intervening. The hymns chanted before and during the battle created an unshakeable faith in victory and high morale. In the context of Clausewitz's 'friction', this high morale minimized friction elements such as numerical disadvantage and difficult terrain. In the confederation, the lack of a common purpose and faith unity created a negative morale multiplier, accelerating the fear of defeat and disintegration.

There is no recorded strategy where either side attempted to disintegrate the enemy before battle through diplomacy, propaganda, or alliance-breaking. On the contrary, the conflict arose directly from a trade dispute and escalated rapidly. Although the Wajin consolidated their political dominance after suppressing the rebellion, this outcome was a consequence of a tactical victory achieved on the battlefield. The principle of 'victory without fighting' did not play a determining role in this particular conflict.

Before direct combat, Sudas, through the hymns and prayers of the priest Vasistha, built a divine legitimacy and psychological superiority. This accelerated the dissolution within the confederation and demoralized the enemy before the battle even began. Moreover, despite a key figure like Vishvamitra being on the opposing side, the religious rhetoric secured the upper hand.