This famous line which is supposed to be the shortest letter written in Japan, is a letter that Shigetsugu wrote in 1575 to his wife from the trenches of the Battle of Nagashiro.
日本一短い手紙、として有名なこの一文は、重次が1575年（天正3年）の長篠の戦いの陣中から妻にあてて書いた手紙である。