The Shimabara Rebellion of 1637” by Takato Yamamoto : r/religionYes. The most notable instance occurred during the Shimabara Rebellion (1637–1638), when the Tokugawa shogunate sent operatives from the famous Kōga ninja clans to infiltrate and sabotage a besieged Christian settlement.

The Shimabara Rebellion

The rebellion was a massive uprising of around 37,000 impoverished peasants and rōnin (masterless samurai)—many of whom were devout Roman Catholics—fighting against extreme taxation and religious persecution. The insurgents retreated to the dilapidated Hara Castle, successfully holding off a massive shogunate army.

The Ninja Infiltration

Because the castle was heavily fortified and food supplies were dwindling slowly, the shogunate recruited Kōga ninja to breach the fortress at night. Their exact missions during this  ...