Morgan Pitelka, Reiko Tanimura, and Takashi Masuda. Letters from Japan’s Sixteenth and Seventeenth Centuries: The Correspondence of Warlords, Tea Masters, Zen Priests, and Aristocrats. Institute for East Asian Studies, UC Berkeley, 2021.
Here is a sample of one letter, by the fierce warlord Takeda Shingen. One of the most respected and feared warlords of the sixteenth century, Shingen wrested control of the province of Kai from his own father, and relentlessly expanded his territory until his sudden death in 1573. A skilled swordsman and perceptive strategist, Shingen is well known for his military activities and effective rule of his domain.