Party Speed Mechanics: The Math Behind Movement

To truly master map movement in Bannerlord, you need to understand the math. Speed isn't just a number; it's a sum of bonuses and penalties.

The Formula

Your speed is calculated as: Speed = (Base Speed + Cavalry Bonus + Leader Bonuses) * (1 - Penalties)

Note: The exact formula in code is complex, but this is the effective logic.

A breakdown of positive and negative modifiers.

Cavalry Bonus (Footmen on Horses)

This is often misunderstood.

• Mounted Troops: Have high base speed.

• Infantry: Have low base speed.

• Footmen on Horses: If you have X infantry and X riding horses in your inventory, your infantry are treated as mounted for map movement.

  • Tip: Sumpter Horses (Pack) do not count for this. You need Riding Horses (Midlands Palfrey, etc.) or Warhorses.

Penalties Explained

1. Herd Penalty

The game allows 2 animals per troop before applying a penalty.

• 1 Mount (for riding).

• 1 Pack Animal (for carry weight).

• Any animal beyond this count contributes to the Herd Penalty.

• Example: 100 troops can manage 200 animals (e.g., 100 warhorses + 100 mules). If you have 300 horses, you will be slowed.

Keep your animal count in check. More is not always better.

2. Terrain Modifiers

Terrain applies a percentage reduction to speed.

• Forest: Severe penalty to cavalry. Battanian culture reduces this.

• Snow: Severe penalty. Sturgian culture reduces this.

• Desert: Slight penalty to non-Aserai.

Navigating around forests can be faster than going through them.

3. Night Penalty

Speed is reduced by roughly 20-30% at night. This applies to everyone, including AI. Use this time to rest or sneak.

4. Prisoners

Prisoners add to your weight and have a dragging effect if they exceed your party's prisoner limit.