One was that the French batteries were so placed that in replying to them it was impossible to avoid shelling the city.
I know where the French batteries were, and if the German guns aimed at them by error missed them and hit the cathedral, the German marksmanship is deteriorating.

To find the range the artillery sends what in the American army are called brace shots--one aimed at a point beyond the mark and one short of it.

From the explosions of these two shells the gunner is able to determine how far he is off the target and accordingly regulates his sights.

Not more, at the most, than three of these experimental brace shots should be necessary, and, as one of each brace is purposely aimed to fall short of the target, only three German shells, or, as there were two French positions, six German shells should have fallen beyond the batteries and into the city.

And yet for four days the city was bombarded! To make sure, I asked French, English, and American army officers what margin of error they thought excusable after the range was determined.