Battle of Kashii

What Happened

On 26 May 1615, the first battle of the Summer Siege of Osaka was fought at Kashii, near Wakayama in the Hine district. A force loyal to Toyotomi Hideyori, lord of Osaka Castle, marched south with the intention of besieging Wakayama Castle, which was held by Asano Nagaakira, an ally of the Tokugawa shogun.

The attacking column was led by three commanders: Ōno Harunaga, Ban Naoyuki, and Okabe Noritsuna. Asano's garrison, rather than waiting behind its walls, recognised that the attackers had advanced far from any source of support or reinforcement. The defenders came out and met them in the open at Kashii.

The result was a defeat for the Toyotomi force. Both Okabe Noritsuna and Ban Naoyuki were killed in the fighting. With two of his three principal commanders dead, Ōno Harunaga was forced to withdraw and retreat back to Osaka.

Background

The battle belongs to the opening phase of the Summer Siege of Osaka, the second and final act of the conflict between the Tokugawa shogunate and the Toyotomi house. The Winter Siege had ended the previous winter without a decisive result, and the shōgun's Eastern Army was preparing to renew the campaign against Osaka Castle.

Before that siege could close in, the Osaka garrison went on the offensive. Toyotomi forces sallied out and launched a series of skirmishes and sieges against Tokugawa positions in the surrounding region. The strike toward Wakayama Castle was one of these forward operations, an attempt to knock out a Tokugawa-aligned strongpoint before the main siege began.

Tachibana Muneshige, serving as military advisor to the second shōgun, Tokugawa Hidetada, had correctly anticipated the movements of the Toyotomi general Ōno Harufusa's troops and guided Hidetada's forces accordingly. The wider campaign was fought in the first year of the Genna era (元和, Genna, a reign-name period), within the Edo period that ran from 1603 to 1868.

Why It Mattered

Kashii was the first engagement of the Summer Siege of Osaka, and it set the tone for what followed. An aggressive Toyotomi sortie, intended to seize the initiative and reduce a Tokugawa ally's castle, instead ended in the deaths of two senior commanders and a retreat.

The failure at Kashii denied the Osaka garrison the early victory it needed. Rather than isolating Wakayama Castle and weakening the Tokugawa network before the main confrontation, the Toyotomi force lost men and leadership and fell back to Osaka. The initiative passed to the shogunate.

The battle also demonstrated the value of anticipating an opponent's movements. Tachibana Muneshige's reading of Toyotomi intentions allowed the Tokugawa side to position its forces to advantage, a pattern that recurred through the summer campaign that ended the Toyotomi challenge for good.

The Name in Japanese

The battle is written 樫井の戦い. Its reading in kana is かしいのたたかい, and in romaji it is Kashii no Tatakai.

Broken down character by character:

• 樫 — read here as かし (kashi). This kanji means "evergreen oak" or "live oak," the dense-leaved oak tree. It is the element that gives the place its name.
• 井 — read here as い (i). This kanji means "well," as in a water well. In place names it very often appears as a suffix, and 樫井 together names the locality where the fighting took place.
• の — read as の (no). This is the possessive and linking particle in Japanese, written in kana rather than kanji. It joins the place name to the word that follows, functioning much like "of" in English.
• 戦 — read here as たたかい (tatakai). This kanji means "war," "battle," or "fight." Alone it is read いくさ (ikusa) or せん (sen) in compounds, but in this phrase it takes the native Japanese reading たたかい.
• い — read as い (i). This final kana completes the reading たたかい. It is written in hiragana rather than kanji, since the word 戦い is spelled with the kanji 戦 plus an okurigana ending.

So the whole name means, plainly, "the battle of Kashii" — the fight at the place called Kashii. The structure is typical of Japanese battle names: a place name, the linking particle の, and a word for battle or war.

Key Figures

Asano Nagaakira — the commander of Wakayama Castle, an ally of the Tokugawa shōgun. His garrison chose to meet the attackers in the field at Kashii rather than endure a siege, and it was his side that won the day.

Ōno Harunaga — one of the three leaders of the Toyotomi force that marched against Wakayama Castle. After the deaths of his fellow commanders, he retreated to Osaka.

Ban Naoyuki — one of the attacking commanders. He was killed in the battle.

Okabe Noritsuna — one of the attacking commanders. He was also killed in the battle.

Tachibana Muneshige — military advisor to the second shōgun, Tokugawa Hidetada. He correctly predicted the movements of the Toyotomi general Ōno Harufusa's troops and guided Hidetada's forces.

Toyotomi Hideyori — lord of Osaka Castle and the head of the Toyotomi house whose loyalist forces launched the attack on Wakayama Castle.

Tokugawa Hidetada — the second shōgun, whose forces Tachibana Muneshige guided during the campaign.