人海戦術
jin.kai.sen.jutsu

Literally: person – ocean – war – technique

Alternately: Human-wave tactics. Assaulting enemy lines with an unsupported mass infantry charge in the hopes of overwhelming them with sheer numbers. By extension, any strategy of throwing large numbers of people at a problem in order to solve it through what mathematicians call “brute force.”

Notes: A close variant may replace 戦術 with 作戦 (sakusen), “tactics” or “strategy.”

Sailing my boat on the sea of souls – Source