Ok, maybe I am reading this upside down or else.
But I would like someone explaining me the art of shooting with artillerie.
Is it the same with a mortar?
Artillery has some special rules, so that is why there is a separate "Artillery" section (pages 73-78). But as for firing itself, its pretty much the same as with other units, except some artillery are capable of indirect fire if they have the Howitzer special rule. For "Howitzer", see pages 54. Which also points to "Indirect Fire" on pages 53-54. Also see "Multiple Launchers" on page 54. And of course, the "Spotters" side bar on page 54 is a must read.