Legendary Site of the Okehazama Battlefield / Attached to

The Field Where a Warlord Fell

On a rain-soaked afternoon in the summer of 1560, Imagawa Yoshimoto led one of the strongest armies in central Japan into Owari Province and did not return. By evening he was dead, his command scattered by a far smaller force under a young provincial lord named Oda Nobunaga. The quiet patch of ground in present-day Toyoake, just south of the old Tōkaidō highway, is the place that tradition fixes as the spot where Yoshimoto was cut down.

That tradition is exactly why the site carries an unusual name. Okehazama Old Battlefield Legendary Site (Okehazama Kosenjō Densetsuchi) was registered as a National Historic Site in December 1937. The word "legendary" in the title is deliberate. Scholars have argued for centuries about where Yoshimoto actually met his end, and a second contender lies barely a kilometer to the southwest, inside the city limits of Nagoya. Of the rival locations, only the Toyoake site holds national designation, and it does so on the strength of the stone monuments gathered here, some of them more than two and a half centuries old.

The designation also covers a second, separate spot a short distance to the northeast: Senjinzuka, a burial mound for the soldiers who died in the battle. The two are listed together as a single property, the battlefield site with Senjinzuka attached.

Why the Battle Still Matters

The Battle of Okehazama is one of the turning points most often cited in the story of Japan's unification. Yoshimoto, lord of Suruga, Tōtōmi, and Mikawa, marched west in the fifth month of Eiroku 3 (1560) at the head of an army that later accounts numbered at around 25,000. Among his vassals rode a young Matsudaira Motoyasu, the future Tokugawa Ieyasu. Nobunaga met the advance with a fraction of those numbers and struck the main camp directly. Yoshimoto's death ended the Imagawa threat to Owari and set Nobunaga on the path that would eventually break the old order of warring provinces.

The older retelling cast the clash as a daring surprise attack by a hopeless underdog, launched against an overconfident enemy who had stopped to celebrate. Recent historians treat that version with more caution. Some read Yoshimoto's campaign as an effort to secure the border between Owari and Mikawa rather than a march on the capital, and others doubt that Nobunaga's force was really so small, or that his approach was truly a hidden ambush. The site rewards visitors who hold both the legend and the debate in mind at once.

What gives the Toyoake ground its weight is the cluster of memorials erected by people who took the tradition seriously long before any modern survey. When the Agency for Cultural Affairs examined the area in the 1930s, it weighed these monuments alongside old documents and maps before granting designation.

What You Will See

The oldest features on the grounds are the Shichiseki-hyō, seven stone markers said to indicate where Yoshimoto and six of his commanders died. They were set up in Meiwa 8 (1771) by two retainers of the Owari domain, Hitomi Yaemon and Akabayashi Magoshichirō. Each bears the inscription "one of the seven stone markers of Okehazama," and the first marker reads "the place where Imagawa Kazusanosuke Yoshimoto died in battle." Six of the seven stand within the site; the second was placed in the nearby Kōtoku-in cemetery.

A short walk away is the Okehazama Eulogy Monument, raised in Bunka 6 (1809). Its text was composed by Hata Kanae, a scholar of the Owari domain, and the monument was put up by descendants of Matsui Munenobu, one of Yoshimoto's senior officers killed in the fighting. The inscription recounts the battle from the Imagawa side, a rare vantage point. It records Yoshimoto boasting that Kiyosu Castle would fall to him by the next morning's breakfast, then traces the sudden assault and his death. For anyone trying to understand how the losing side remembered the day, the carved account is genuinely valuable.

Scattered among these are a grave marker for Yoshimoto erected in the Meiji era, the tomb of Matsui Munenobu, and a stone simply naming the old battlefield. The present landscaped park is itself a piece of history of a different kind: because the land was low and marshy, ringed by ponds, the area was raised by about three meters of fill in 1966 to create the setting visitors walk through today. Volunteer guides are often on hand, and arranging one in advance turns a row of weathered stones into a sequence of stories.

Around the Site

About a kilometer northeast lies Senjinzuka, the mound included in the same designation. After the battle, Kaiō Ryūki, the second abbot of nearby Sōgen-ji temple, had the bodies of the fallen gathered and buried, ordering a junior priest and local villagers to raise the mounds. Roughly 2,500 soldiers from both sides are said to have died, and the mound was first known as Suruga-zuka. Most of the original mounds vanished as houses spread across the area, leaving this one as the surviving example. The memorial stone on its crown dates to Genbun 4 (1739), raised for the 180th anniversary of the deaths. Sōgen-ji still holds a memorial service each year on the day of the battle, an unbroken thread of remembrance more than four and a half centuries long.

Sōgen-ji itself sits close by and keeps a memorial tablet for Yoshimoto in its main hall; its temple gate is a registered cultural property of the city. Visitors curious about the rival claim can continue southwest to Okehazama Old Battlefield Park in Nagoya's Midori Ward, where bronze statues of Nobunaga and Yoshimoto were installed in 2010 and a miniature landscape recreates the camps and roads of the campaign. Each location holds its own Okehazama festival in early June, around the anniversary, with armored processions, battle reenactments, and memorial rites for the dead of both armies.