Multiple suicide bomber attacks in 1904 or 1905

This is very intriguing – a second hand report about Japanese troops using multiple suicide bombing as a tactic against the Russians in 1904 or 1905. I’ve spent a few hours looking for a primary source or even a better secondary source and can’t find one – vague references to the tactic but no specifics.  Fascinating in its implications.   Rather than lift the story, here’s a straight image from the book, as is.