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INTERACTIVE BATTLE

Keicho Dewa Campaign (Battle of Hasedo)

October 1600 · Hasedo Castle, Dewa Province

An Uesugi army under Naoe Kanetsugu invaded Mogami territory but failed to take Hasedo Castle and withdrew after news of Sekigahara.

Background

After the Aizu expedition turned west, the Uesugi attacked Mogami territory amid both the national conflict and a long regional struggle over Shonai.

Outcome

Hasedo held out. After learning of the Western defeat at Sekigahara, the Uesugi withdrew to Okitama. The Uesugi were later reduced to Yonezawa and the Mogami enlarged.

Keicho Dewa Campaign (Battle of Hasedo) — Hasedo Castle, Dewa Province

Course of the battle

1　September 1600

The Uesugi invade Mogami territory

An Uesugi army under Naoe Kanetsugu advanced from Yonezawa and Shonai into Mogami territory and took Hataya Castle.

上杉景勝

Uesugi Kagekatsu — lord of the Uesugi clan

最上義光

Mogami Yoshiaki — commanded the Mogami army

伊達政宗

Date Masamune — supported the Mogami forces

Sources123·Certainty: Medium

2　September 1600

Hasedo Castle withstands the attack

Hasedo Castle, defended by Shimura Akiyasu and others, resisted while Mogami Yoshiaki moved to relieve it from Yamagata.

上杉景勝

Uesugi Kagekatsu — lord of the Uesugi clan

最上義光

Mogami Yoshiaki — commanded the Mogami army

伊達政宗

Date Masamune — supported the Mogami forces

Sources123·Certainty: Medium

3　Late September to October

The Uesugi withdraw

After news of the Western defeat at Sekigahara, the Uesugi withdrew toward Okitama under pursuit by Mogami and Date forces.

上杉景勝

Uesugi Kagekatsu — lord of the Uesugi clan

最上義光

Mogami Yoshiaki — commanded the Mogami army

伊達政宗

Date Masamune — supported the Mogami forces

Sources123·Certainty: Medium

Historical significance

The campaign is treated not merely as a northern Sekigahara but as a regional war over Shonai, Okitama, and the Yamagata basin.

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Key figures

上杉氏

1

上杉景勝

Uesugi Kagekatsu — 上杉家当主

Uesugi faction

Sources123·Certainty: Medium

最上氏

1

最上義光

Mogami Yoshiaki — 最上軍の指揮

最上・徳川方

Sources123·Certainty: Medium

伊達氏

1

伊達政宗

Date Masamune — 最上方を支援

最上・徳川方

Sources123·Certainty: Medium

Other events of 1600

Month 8　丹後国田辺城の戦い始まる8/26　山城国伏見城の戦い始まる9/2　下野国小山評定9/8　山城国伏見城落城9/15　美濃国本多忠勝、関ヶ原で軍監を務める9/15　美濃国島津の退き口9/30　美濃国岐阜城落城Month 10　信濃国第二次上田合戦Month 10　美濃国藤堂高虎が関ヶ原で東軍に属し今治を領す10/13　近江国大津城の戦い始まる10/19　豊後国石垣原の戦い10/20　美濃国杭瀬川の戦い10/21　美濃国関ヶ原の戦い10/21　近江国大津城開城10/27　近江国石田三成が捕らえられる11/6　山城国石田三成らが六条河原で処刑される紀伊国桑山氏が東軍に属し紀伊から退去陸奥国伊達政宗が白石城を奪還

Notes on the data

Troop totals, losses, and individual exploits are limited to what the research note supports.

Sources consulted

  1. 山形市「長谷堂城跡」
  2. 山形城公式「歴代城主」
  3. 山形市地域教材「長谷堂合戦」

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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