Battle of Awa

What Happened

On 28 January 1868, two fleets met in the waters off Awa Province, near the entrance to Osaka Bay. On one side were ships of the Tokugawa shogunate, the military government that had ruled Japan for more than two and a half centuries. On the other were vessels belonging to Satsuma, a domain in southern Kyushu that had thrown its support behind the imperial court in Kyoto.

The shogunal fleet was commanded by Enomoto Takeaki, a naval officer trained in the Netherlands. The engagement was short and decisive: the shogunal ships got the better of the Satsuma vessels, and Enomoto's force emerged victorious. It was one of the few clear Tokugawa successes of the entire Boshin War.

The timing was stark. The battle took place one day after the land Battle of Toba–Fushimi, which had begun on 27 January 1868 and which the shogunate lost to the imperial forces. So on the same week that the Tokugawa cause suffered a crippling defeat on land, its navy won at sea.

Background

The Boshin War (戊辰戦争, Boshin sensō) was a civil war fought in 1868–1869 between the Tokugawa shogunate and an alliance of domains backing the imperial court. Its root cause lay in the political crisis that followed the arrival of American warships in 1853 and the subsequent opening of Japan to foreign trade. That upheaval split the ruling class over whether to resist the foreign powers, how far to reform, and who should hold authority — the shogun in Edo or the emperor in Kyoto.

By the end of 1867 the last shogun, Tokugawa Yoshinobu, had agreed to hand political power back to the emperor, an event known as the Taisei Hōkan. But the settlement satisfied neither side. The Satsuma and Chōshū domains pressed for a genuine transfer of power and for the punishment of the Tokugawa house; Yoshinobu's supporters, meanwhile, expected the Tokugawa to remain the dominant force in government. In January 1868 fighting broke out near Kyoto at Toba and Fushimi.

Both sides had been buying and building modern warships, and both had sent men abroad to study Western naval science. Enomoto Takeaki had spent years in the Netherlands with the Dutch navy, and on his return he helped build the shogunate's fleet into the most modern in Japan. Satsuma, for its part, had its own steam-powered vessels and a strong interest in the sea routes around Osaka and the Inland Sea. When the land war began, control of the water between Osaka and the Kii Channel became an immediate practical question.

Why It Mattered

Awa was the second naval battle in Japanese history fought between modern naval forces, following the 1863 Battle of Shimonoseki Straits. That fact alone marks it as a milestone: within five years, Japan had gone from a first clash involving Western-style steam warships to sustained fleet actions between organised naval forces.

Militarily, the result was a Tokugawa victory, and it demonstrated that Enomoto's fleet could hold its own against the Satsuma ships. But a naval win could not reverse the strategic situation. The defeat at Toba–Fushimi had already committed the imperial side to a march on Edo, and the political momentum ran against the shogunate regardless of what happened at sea.

Enomoto's career after Awa shows how the war ended. He continued to command the shogunal navy, withdrew from the capital, and eventually led the remnants of the Tokugawa fleet north to Hokkaido, where he and his men established the short-lived Republic of Ezo. He surrendered in 1869 and was later pardoned, going on to serve the new Meiji government as a senior naval and diplomatic figure. The Battle of Awa thus sits at the opening of the war, in the last weeks in which the Tokugawa shogunate still functioned as a government with a navy to send into battle.

The Name in Japanese

The Japanese name is 阿波沖海戦, read あわおきかいせん (Awa oki kaisen).

• 阿 — read あ (a) here. This character is used chiefly for its sound in place names; in this word it is the first element of Awa, the province name.
• 波 — read わ (wa) here. Its everyday meaning is "wave." Together, 阿波 (Awa) is the name of a province, corresponding roughly to modern Tokushima Prefecture on the island of Shikoku.
• 沖 — read おき (oki). It means "offing" or "open sea" — the water some distance from shore. In naval and geographic names it signals that the action took place offshore rather than in a harbour or on land.
• 海 — read かい (kai). It means "sea" or "ocean."
• 戦 — read せん (sen). It means "war," "battle," or "combat."

So the whole name parses as Awa + offshore + sea + battle: the sea battle off the coast of Awa. The compound 海戦 (kaisen) is the standard Japanese word for a naval battle, built from "sea" plus "battle." The same 戦 appears in 戦争 (sensō, war) and 戊辰戦争 (Boshin sensō, the Boshin War), and the same 海 appears in 海軍 (kaigun, navy).

Key Figures

Enomoto Takeaki (榎本武揚, えのもと たけあき) commanded the shogunal navy at Awa and led it to victory. He had studied naval science in the Netherlands and was the foremost naval officer of the Tokugawa regime. After the shogunate's collapse he led its surviving fleet to Hokkaido and became president of the Republic of Ezo, surrendering in 1869. He was later pardoned and served the Meiji government in senior naval and diplomatic posts.

Tokugawa Yoshinobu (徳川慶喜, とくがわ よしのぶ) was the last shogun. He had returned political authority to the emperor in 1867, and the failure of that settlement to hold led directly to the outbreak of the Boshin War in January 1868, the month of the Battle of Awa.

The Satsuma domain (薩摩藩, さつまはん), based in southern Kyushu, supplied the ships that faced Enomoto at Awa. Satsuma was one of the two domains, alongside Chōshū, that drove the imperial cause and that would dominate the new government after the war.