From the Design Philosophy section of the rules:
"In this updated version the writers have endeavored to reflect the era 1680-1720 more closely. This has involved adding rules or modifying existing rules to allow players to better recreate the warfare of the period. Artillery are now very difficult to move once placed into position but can now bombard. For cavalry there are now rules for light and eastern types of horse as well as cavalry that charge at the gallop. Various kinds of infantry are also now covered and some of these include: matchlock armed troops as well as varying amount of pikes. Some of the original rules have been modified to reflect the era; for example, the use of squares and rules for command and army morale. In addition, new rules have been added to reflect different unit sizes and motivation."