Tenshō Iga War

First Tenshō Iga War
Part of the Sengoku period
Date October 6–7, 1579 Location Iga Province Result Iga victory, independence maintained
Belligerents
Oda clan	Inhabitants of Iga
Commanders and leaders
Oda Nobukatsu Tsuge Saburō Nagano Sakyōnosuke
Strength
10,800

Second Tenshō Iga War
Part of the Sengoku period
Date September 30-October 8, 1581 Location Iga Province Result Oda victory, province brought under Oda Nobunaga's control
Belligerents
Oda clan	Inhabitants of Iga
Commanders and leaders
Oda Nobunaga Oda Nobukatsu Takigawa Kazumasu Gamō Ujisato Tsutsui Junkei
Strength
42,000	10,000 or less

Tenshō Iga War (天正伊賀の乱, Tenshō Iga no Ran^?) is the name of two invasions of Iga province by the Oda clan during the Sengoku period. The province was conquered by Oda Nobunaga in 1581 after an unsuccessful attempt in 1579 by his son Oda Nobukatsu. The names of the wars are derived from the Tenshō era name (1573–1592) in which they occurred. Other names for the campaign include "The Attack on Iga" (伊賀攻め, Iga-zeme^?) or "Pacification of Iga" (伊賀平定, Iga Heitei^?).

Geographically, the Iga region was surrounded by mountains on all sides that could only be passed through via narrow pathways. This, plus the distance of the region from major transportation routes, meant that Iga was easily defensible by a relatively small number of men and was not a priority target for outside forces. The Niki clan had served as shugo of the province for the Ashikaga shogunate, but their control had never been strong and soon weakened further as the shogun's authority diminished. No great warlord rose to take their place, although the Rokkaku to the north and the Kitabatake to the east extended their influence over parts of the province. Instead, as also happened in some neighboring areas, the province came to be controlled by a league (ikki) of the numerous local warrior clans (jizamurai) which had formed to defend the area's independence from outside military forces. The earliest details of the league are unknown, but by the mid-16th century it had been formalized as an organization known as the "league of all the commons of Iga" (伊賀惣国一揆, Iga Sōkoku Ikki^?).

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