was an officer for the Toyotomi clan following the 16th-century Azuchi-Momoyama period

Azuchi-Momoyama period

The came at the end of the Warring States Period in Japan, when the political unification that preceded the establishment of the Tokugawa shogunate took place. It spans the years from approximately 1573 to 1603, during which time Oda Nobunaga and his successor, Toyotomi Hideyoshi, imposed order...

 through the early years of the 17th-century Edo period

Edo period

The , or , is a division of Japanese history which was ruled by the shoguns of the Tokugawa family, running from 1603 to 1868. The political entity of this period was the Tokugawa shogunate....

 in Japan.

Katsunaga fought in the Battle of Sekigahara

Battle of Sekigahara

The , popularly known as the , was a decisive battle on October 21, 1600 which cleared the path to the Shogunate for Tokugawa Ieyasu...

 and at the western legion but was met with defeat there. Later, during the Siege of Osaka

Siege of Osaka

The was a series of battles undertaken by the Tokugawa shogunate against the Toyotomi clan, and ending in that clan's destruction. Divided into two stages , and lasting from 1614 to 1615, the siege put an end to the last major armed opposition to the shogunate's establishment...

, Katsunaga tricked a guard to infiltrate Osaka castle

Osaka Castle

is a Japanese castle in Chūō-ku, Osaka, Japan.Originally called Ozakajō, it is one of Japan's most famous castles, and played a major role in the unification of Japan during the sixteenth century of the Azuchi-Momoyama period.-Description:...

. He defeated Honda Tadatomo

Honda Tadatomo

a retainer of the Japanese clan of Tokugawa following the Azuchi-Momoyama period of the 16th century to the Edo period of the 17th century of Japan. Tadatomo was the younger son of the famous Honda Tadakatsu, one of Four Guardians of the Tokugawa. Tadatomo received a 100,000-koku fief at Ōtaki in...

 (an officer for the Tokugawa

Tokugawa clan

The was a powerful daimyo family of Japan. They nominally descended from Emperor Seiwa and were a branch of the Minamoto clan by the Nitta clan. However, the early history of this clan remains a mystery.-History:...

) there in the summer.