> The cannonball crashed into the church and went through a first wall. It then ended on the altar of the Chapel of the Virgin. [...] The cannon ball was walled into the left wall of the Chapel and a commemorative epigraph was added to it.
It wasn't showing the wall where it had crashed through, it's showing where the ball has been mounted into the wall for display.
> The cannonball crashed into the church and went through a first wall. It then ended on the altar of the Chapel of the Virgin. [...] The cannon ball was walled into the left wall of the Chapel and a commemorative epigraph was added to it.
It wasn't showing the wall where it had crashed through, it's showing where the ball has been mounted into the wall for display.