In games of Warhammer: the Old World - Battle March, players field armies of between 400 points and 750 points.
Exactly what size an army should be depends upon what the players prefer, and players are encouraged to play games with different points values, rising in 50 point increments from 400 to 750, to find the size of the Battle March game they enjoy the most.

Muster lists for Battle March armies are written as described in the Warhammer: the Old World rulebook. However, there are a few key differences to bear in mind.

Note that, should players wish, these rules can also be used when creating an Allied Contingent for a larger army.

Minimum Two Units

When writing your muster list for a game of Warhammer: the Old World - Battle March, your army must include a minimum of two non-character units (rather than the usual three units). Unlike when writing a muster list for a larger game, this minimum can include war machines but, as usual, cannot include 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 in games of Battle March are unlikely to include huge regiments or large numbers of elite troops. To represent this, when writing your muster list, no unit may have a Unit Strength higher than 20, and 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 could include a single Goblin Rock Lobber or Doom Diver, both of which are limited to 0-1 per 1,000 points. Alternatively they could give a single Goblin Mob the Skirmishers special rule, an option limited to 0-1 unit per 1,000 points.