INTERACTIVE BATTLE
Shikoku Campaign
June to July 1585 · Awa, Sanuki, Iyo and Tosa Provinces
Hashiba Hideyoshi sent armies into Shikoku on three fronts against Chosokabe Motochika. Motochika submitted, retained only Tosa, and Shikoku was reorganized under Hideyoshi's settlement.
Background
Motochika had expanded from Tosa across most of Shikoku. Hideyoshi mobilized the Mori and Ukita and sought to bring Shikoku into his political order.
Outcome
A settlement was reached in July. Motochika gave a hostage and withdrew to Tosa. Tosa remained with Motochika, while Sanuki, Iyo and Awa went to Sengoku Hidehisa, Kobayakawa Takakage and Hachisuka Iemasa.
Course of the battle
1 June 1585
Mori forces cross to Iyo
Mori forces led by Kobayakawa Takakage and Kikkawa Motonaga crossed to Iyo and attacked Chosokabe positions. They took Takao Castle, and Kono Michinao of Iyo submitted to Takakage.
Points of debate
Neither the landing point nor the site of Takao Castle is identified in the sources used here. The map marks Yuzuki Castle, the Kono seat in Iyo, as a reference point for this front.
Sources1234·Certainty: High
2 June 1585
Hidenaga and Hidetsugu land in Awa
3 June 1585
Landing in Sanuki
Sengoku Hidehisa and Bito Tomonobu, attached to the Ukita and Kuroda forces, landed at Yashima and reduced castles in Sanuki, according to the Kagawa prefectural chronology.
Points of debate
The list and order of the castles taken are not established in the sources used here.
Landed at Yashima and took castles in Sanuki
Landed at Yashima with Sengoku Hidehisa
Formed part of the Sanuki front
Sources1236·Certainty: Medium
4 June to July 1585
The invading armies besiege Ichinomiya and Waki
5 July 1585
Motochika accepts a settlement
Chosokabe Motochika accepted terms, provided a hostage and withdrew to Tosa.
Points of debate
和議の日は原資料の旧暦表記を西暦へ換算せず、月までとする。
和議を受け入れ土佐へ退く
Handed over as a hostage
Sources1235·Certainty: High
Historical significance
Shikoku moved from broad Chosokabe control to an order in which Hideyoshi allocated provinces among lords. The campaign also demonstrated his ability to mobilize powerful houses across regions.
Key figures
羽柴氏
4
Commander of the Awa army
Landed in Awa and directed the attacks and sieges there.
Sources1·Certainty: High
Commander on the Sanuki front
Formed the Sanuki front together with the Ukita forces.
Sources6·Certainty: Medium
Commander who landed in Sanuki
Landed at Yashima together with Sengoku Hidehisa.
Sources6·Certainty: Medium
宇喜多氏
1
Commander on the Sanuki front
Advanced through Sanuki and joined the Awa army.
Sources1·Certainty: High
毛利氏
2
Commander on the Iyo front
Led Mori forces across to Iyo and attacked Chosokabe positions.
Sources1·Certainty: High
Commander on the Iyo front
Crossed to Iyo together with Kobayakawa Takakage.
Sources1·Certainty: High
長宗我部氏
2
Commander-in-chief of the Chosokabe
Resisted across Shikoku before accepting terms and withdrawing to Tosa.
Sources1·Certainty: High
Third son handed over as a hostage
Handed over as a hostage when the truce was concluded.
Sources6·Certainty: Medium
仙石氏
1
Commander who landed in Sanuki
Landed at Yashima, took castles in Sanuki, and received Sanuki after the campaign.
Sources6·Certainty: Medium
河野氏
1
Daimyo of Iyo
Submitted to Kobayakawa Takakage after his crossing to Iyo.
Sources4·Certainty: Medium
Other events of 1585
Notes on the data
The sources mainly use lunar-calendar dates, so the page gives only June to July 1585. Total troop numbers and exact routes remain uncertain; only movements supported by the cited sources are shown.
Sources consulted
- 東京大学史料編纂所『大日本史料 第十一編之十七』
- 文化遺産データベース「羽柴秀吉御内書」
- 徳島市立徳島城博物館「長宗我部元親書状」
- 松山市「室町時代から安土・桃山時代」
- 城郭マスタ（shiro.geojson）
- 香川県立図書館「香川県史年表」
The numbers in the text refer to the list above. Certainty indicates how far a statement is supported by the cited sources; it does not refer to the precision of the coordinates or the dating.
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