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1274 and 1281 · Two Mongol invasions

Building a stone barrier at Hakata Bay

A barrier built between two invasions reveals defence and maritime exchange.

Hakata Bay, Fukuoka

The first invasion changes defence

In 1274 Yuan forces reached Hakata Bay and fighting extended inland. The government prepared to obstruct future landings, building stone defences in 1276. Continental politics thus prompted construction and surveillance on the Kyūshū shore.

The walls followed a broad coastal strip rather than concentrating defence in one castle. Quarrying, transport and building were followed by guarding and repair. Defence continued between battles while resources were committed against a possible return.

[1] 福岡市[2] 福岡市[3] 福岡市史編さん室

Building on sand to obstruct landing

Excavations at Nishijin and Momochi identified clay preparation beneath stonework on sandy ground. The wall was an engineered response to local conditions rather than simply a large pile of stones. Materials and construction varied along the coast.

In 1281 the wall and defenders obstructed landing before storms inflicted severe losses on the fleet. Explaining the outcome by weather alone omits preparations and resistance; attributing everything to the wall omits maritime operations. The sequence combined several conditions.

[1] 福岡市[3] 福岡市史編さん室[2] 福岡市

Vigilance after the invasions

Repairs continued against a further possible attack. Defence involved continued expenditure after victory. Hakata’s sea routes served trade and cultural contacts while also exposing the port to invasion, making exchange and security simultaneous concerns.

Reclamation moved the coastline, and some stone was reused in later construction. Remains now inland once stood by the shore. Reconstructing that geography explains their purpose and connects the invasions with the material work of defence.

[2] 福岡市[3] 福岡市史編さん室

Before and after

  1. 1274

    First invasion, the Bun’ei campaign.

  2. 1276

    Construction of the defensive wall.

  3. 1281

    Second invasion, the Kōan campaign.

Key terms

Defensive wall
Coastal works intended to impede landing.
Bun’ei invasion
The invasion of 1274.
Kōan invasion
The invasion of 1281.

What supports the account?

The wall followed the first invasion.

Fukuoka dates construction to 1276.

Limits of the evidence

Do not assign identical coastal works to both invasions.

[1] 福岡市

The present shoreline cannot fully explain its location.

Site interpretation discusses changing terrain.

Limits of the evidence

Interpret inland remains in their original coastal setting.

[1] 福岡市[2] 福岡市

Check your understanding

Choose an answer to reveal the explanation. Return to the article and sources when you are unsure.

1. Why prepare a clay foundation rather than pile the defensive stones directly on sand?

Sources

  1. The Mongol-invasion defensive wall福岡市

    Construction in 1276, extent, excavated foundations and shoreline changes.

  2. History of Hakata Port福岡市

    The two invasions and overseas trade before and after them.

  3. Genkō defensive walls: Fukuoka history福岡市史編さん室

    Construction after 1274, resistance to landing in 1281, storm losses and subsequent maintenance; troop estimates are not reproduced.

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