That would be the FRICTION of war. People continually talk about the FOG of war, but the Prussian who is given credit for coining the term never talked of fog other than it being a meteorlogical even, low clouds. FRICTION, on the overhand are the physical impediments in accomplishing a task or winning a war and FRICTION is what the Prussian General continually wrote of.
I just had to point that out.
Thanks! Doesn’t sound quite as snappy in English, but it’s probably more accurate.