Warhammer: the Old World is a game in which large armies march to war. Yet not all battles in the World of Legend are fought between such mighty hosts. Many are fought between far smaller forces. Be they the vanguards of larger armies clashing ahead of a great battle, or warbands of bandits and raiders plundering enemy territory, skirmishes between small forces can be every bit as exciting as pitched battles between magnificent armies.
With this in mind, the rules that follow are intended to add greater depth to games played using armies of between 500 and 750 points.
Note that, should players wish, these rules can also be used when creating an Allied Contingent for an army of between 2,000 and 3,000 points.
Minimum Two Units
When writing your muster list for a game of Battle March, your army must include a minimum of two non-character units. This minimum can include war machines, but cannot include units whose troop type is swarms' or war beasts?
Character Limitations
As with any army, an army created for Battle March must include at least one character to act as its General. However, when writing your muster list, you may not spend more than:
- 25% of your army's total points value on a single character. 
Unit Limitations
By their nature, the armies represented by Battle March are unlikely to include huge regiments or large numbers of elite troops. To represent this, when writing your muster list, you may not spend more than:
- 35% of your army's total points value on a single Core unit. 
- 30% of your army's total points value on a single Special unit. 
- 25% of your army's total points value on a single Rare or Mercenary unit. 
0-X Per 1,000 Points
Players of Warhammer: the Old World will already be aware that many units or options are limited to '0-X per 1,000 points', with 'X' being a number. This means that such options would not normally be allowed when writing a muster list for an army of less than 1,000 points. However, rather than preclude such fun and characterful options entirely, when writing a muster list for a game of Battle March, you may include a single such option. This might be a unit, a character or even an upgrade listed within a unit's options.
For example, a player writing an Orc and Goblin Tribes muster list for a game of Battle March, using that faction's grand army composition list, could choose to include a single Goblin Rock Lobber or Doom Diver, both of which are limited to 0-1 per 1,000 points. Alternatively they could choose to give a single Goblin Mob the Skirmishers special rule, an option limited to 0-1 unit per 1,000 points.