For every artillery that is paired one-to-one with an infantry, the infantry attacks at 2 or less.
Artillery is one of those units that you just don't know what to do with. They're an average unit with only 2 attack and 2 defence, so you cant expect them to do much damage. Aside from this though, it is important that you should build a few, since they give your infantry an attack bonus. This goes for every country that you play as.
Edition Specific StrategiesEdit
50th Anniversary Edition StrategiesEdit
Revised Edition StrategiesEdit
Original Edition StrategiesEdit
Artillery are not included in the original edition. This makes Infantry even more important.