I just read that complete page on Barrages. I never realized it had gotten so sophisticated even by 1917. We see movies where artillery is always just raining

I just read that complete page on Barrages. I never realized it had gotten so sophisticated even by 1917. We see movies where artillery is always just raining down from the sky. It seemed so random. It blows my mind we had complex patterns and essenstially formations and defensive walls and boxes to protect a position and just wow. That must have been hell on the receiving end.