The Eastern army arrives by early June,…

The Eastern army arrives by early June, before Hideyori manages to secure any land to use against them.

Six hundred of his men encounter twenty-three thousand of the Eastern Army on June 2 at the battle of Dōmyōji.

Hideyori's commander at the battle, Gotō Matabei, attempts to retreat into the fog, but the battle is lost and he is killed.

After this, Tokugawa forces intercept those of Toyotomi general Sanada Yukimura at Honta-Ryo.

Sanada tries to force a battle with Date Masamune, but Date retainer Katakura Shigenaga retreats since his troops are exhausted; Sanada's forces follow suit.

The same night, Chōsokabe Morichika and Tōdō Takatora battle at Yao.

Another battle takes place at Wakae around the same time, between Kimura Shigenari and Ii Naotaka.

Chōsokabe's forces achieve victory, but Kimura Shigenari is defected by the left wing of Ii Naotaka's army.

The main Tokugawa forces move to assist Todo Takatora after Shigenari's death, and Chōsokabe withdraws for the time being.

After another series of shogunate victories on the outskirts of Osaka, the Summer Campaign comes to a head at the battle of Tennoji.

Hideyori plans a hammer-and-anvil operation, in which fifty-five thousand men would attack the center of the Eastern Army, while a second force, of sixteen thousand five hundred men, would flank them from the rear.

Another contingent waits in reserve.

Ieyasu's army is led by his son, the Shogun Tokugawa Hidetada, and numbers around one hundred and fifty-five thousand.

They move in four parallel lines, prepared to make flanking maneuvers of their own.

Mistakes on both sides nearly ruin the battle, as Hideyori's ronin split off from the main group, and Hidetada's reserve force moves up without orders from the main force.

In the end, however, Hideyori's commander Sanada Yukimura is killed, destroying the morale of the Western Army.

The smaller force led directly by Hideyori sallies forth from Osaka Castle too late, and is chased right back into the castle by the advancing enemies; there is no time to set up a proper defense of the castle, and it is soon ablaze, and being pummeled by artillery fire.

Hideyori commits seppuku, and the final major uprising against Tokugawa rule is put to an end, leaving the shogunate unchallenged for another two hundred and fifty or so years.

After the fall of the castle, the shogunate announces laws including Ikkuni Ichijōrei (one province can contain only one castle) and Bukeshohatto (or called Law of Buke, which limits each daimyō to own only one castle and obey the castle restrictions).

The shogunate's permission has to be obtained prior to any castle construction or repair from this point on.

Many castles are also forced to be destroyed as a result of compliance with this law.