Editing Ninja (section)

===Shimabara rebellion===
[[File:Ninja Historic Illustration 18th Century.png|thumb|Ninja historic illustration, Meiwa era, {{Circa|1770}}]]

A final but detailed record of ninja employed in open warfare occurred during the [[Shimabara Rebellion]] (1637–1638). The Kōga ninja were recruited by ''[[Shogun|shōgun]]'' [[Tokugawa Iemitsu]] against [[Christianity in Japan|Christian]] rebels led by [[Amakusa Shirō]], who made a final stand at [[Hara Castle]], in [[Hizen Province]]. A diary kept by a member of the [[Matsudaira clan]], the ''Amakusa Gunki'', relates: "Men from Kōga in [[Ōmi Province]] who concealed their appearance would steal up to the castle every night and go inside as they pleased."

The Ukai diary, written by a descendant of Ukai Kanemon, has several entries describing the reconnaissance actions taken by the Kōga.

{{blockquote|They [the Kōga] were ordered to reconnoitre the plan of construction of Hara Castle, and surveyed the distance from the defensive [[moat]] to the ''ni-no-maru'' (second [[Motte-and-bailey castle|bailey]]), the depth of the moat, the conditions of roads, the height of the wall, and the shape of the loopholes.<ref name="Turnbull 2003 51">{{Harvnb|Turnbull|2003|p=51}}</ref>|Entry: 6th day of the 1st month}}

[[File:Remains of Hara castle.jpg|thumb|The ruins of [[Hara Castle]]]]
Suspecting that the castle's supplies might be running low, the siege commander [[Matsudaira Nobutsuna]] ordered a raid on the castle's provisions. Here, the Kōga captured bags of enemy provisions, and infiltrated the castle by night, obtaining secret passwords. Days later, Nobutsuna ordered an intelligence gathering mission to determine the castle's supplies. Several Kōga ninja—some apparently descended from those involved in the 1562 assault on an [[Imagawa clan]] castle—volunteered despite being warned that chances of survival were slim. A volley of shots was fired into the sky, causing the defenders to extinguish the castle lights in preparation. Under the cloak of darkness, ninja disguised as defenders infiltrated the castle, capturing a banner of the [[Christian cross]]. The Ukai diary writes,

{{blockquote|We dispersed spies who were prepared to die inside Hara castle.&nbsp;... those who went on the reconnaissance in force captured an enemy flag; both Arakawa Shichirobei and Mochizuki Yo'emon met extreme resistance and suffered from their serious wounds for 40 days.|Entry: 27th day of the 1st month}}

As the siege went on, the extreme shortage of food later reduced the defenders to eating [[moss]] and grass. This desperation would mount to futile charges by the rebels, where they were eventually defeated by the shogunate army. The Kōga would later take part in conquering the castle:

{{blockquote|More and more general raids were begun, the Kōga ninja band under the direct control of Matsudaira Nobutsuna captured the ''ni-no-maru'' and the ''san-no-maru'' (outer bailey)|Entry: 24th day of the 2nd month}}

With the fall of Hara Castle, the Shimabara Rebellion came to an end, and Christianity in Japan was forced [[Kakure Kirishitan|underground]].<ref name="Morton Olenik 2004 122">{{Harvnb|Morton|Olenik|2004|p=122}}</ref> These written accounts are the last mention of ninja in war.<ref name="Crowdy 2006 52">{{Harvnb|Crowdy|2006|p=52}}</ref>