ใครพอทราบบ้างครับการต่อสู้กลุ่มๆแบบนี้ คือกีฬาหรืออะไร?

อ่านแล้วสงสัย เลย google ดู
ดูเหมือนจะเรียกว่า wall-to-wall (wall-on-wall) fights นะคะ

"The "wall-on-wall" fight (with anywhere from dozen to several hundreds participants) was performed strictly by rules and could go on for hours. Both "walls" had a chief fighter, who served as a tactician and a commanding officer. "Walls" themselves were tight straight formations 3-4 ranks deep. Repeated attacks were performed, aiming to push the opposing "wall" out of the game area. Basic tactics were used, such as breaching using heavy fighters (who were usually held in reserve), encircling, false retreat and others; but as a rule, tight wall formation never broke. Tactics also included battle planning. The "wall-on-wall" fights, while performed for entertainment, were in fact close to military training."

http://en.wikipedia.org/wiki/Russian_fist_fighting

http://youtu.be/0ySu-TW2psE