--Trench warfare
WWI
Used by all sides
little advancement, poor conditions (wet, cold, pests, etc.)
-- New weapons
machine gun, tanks, poison gas, flame throwers, aircraft
WWI specifically
stalement, mass casualty
--blitzkreig
WWII
Germany
fast tanks, powerful aircraft
Took enemy by surprise, force is crushing and overwhelming, successful
--Torch and burn land?
WWII
Russia
Stopped enemy advancement
Successful against Napolean, but not against the Luftwaffe that remembered history.
--Kamikazes
WWII
Japan
sunk or damaged many ships, loss of soldier life
Atomic Bomb
WWII
United States
destroyed mass amount of land and people, radiation, quick end to war in Pacific, reduced possible further American casualties
= grand total of many human deaths and suffering