Part of the Advanced Combat Series:

Expedition Lineup Frameworks: Choosing the right heroes for every role.

Explorer's Cabin Guide: Understanding the parallel Exploration system.

Infirmary & Healing Guide: Managing casualties from Expedition battles.

Expedition is the umbrella term for every world-map battle in Whiteout Survival. Anything that resolves with marches, rallies, or troop deployments on the world map is an Expedition battle.

This guide covers how these battles resolve, how skills stack in rallies and garrisons, and how the Labyrinth serves as the ultimate test of your Expedition stats.

Expedition vs. Exploration

The two systems have different stats, hero skill sets, and gear contributions. Confusing them is one of the most expensive mistakes in the game.

Feature	Expedition	Exploration
Location	World Map (Tundra)	Exploration Tab / Arena / Crazy Joe
Units	Your trained City Troops	Hero Escorts (fixed by level)
Skills	Expedition Skill Set (3rd row)	Exploration Skill Set (2nd row)
Mechanic	Turn-based, large-scale army	Ability-driven, small squad combat
Stats	Gear (Lv 6+), Tech, Charms, Pets	Gear (Lv 1-5), Hero Levels

1. How Expedition Combat Resolves

Every Expedition battle uses the same core resolution loop:

Deployment: Both sides deploy squads with specific troop ratios (Infantry/Lancer/Marksman).
Turn Loop: Both sides simultaneously select targets and attack. Damage is tallied, and casualties are calculated.
End Condition: The battle ends when all troops on one side are defeated.

Row Positioning and Targeting

Troops deploy in three rows:

Front Row (Infantry): The durability layer.
Middle Row (Lancers): The flanking layer.
Back Row (Marksmen): The damage layer.

The Leap Mechanic: Lancers can "leap" directly to the back row, bypassing the frontline to threaten Marksmen. This is their primary mechanical role.

Hero Skill Independence

Hero Expedition skills activate even if the squad has zero troops of the matching type. If you put an Infantry hero in a 100% Marksman squad, that hero's skills still proc. This independence allows for "buff stacking" in rallies and garrisons.

2. Casualty Rules by Battle Type

Different battle types apply different casualty distributions. Knowing your risk is essential before launching a march.

Battle Type	Casualty Rule
Player City Attack (PvP)	35% of attacker's casualties die; 65% go to Infirmary.
Sunfire Castle	Infirmary fills first. Deaths only occur once capacity is hit.
Beast / Polar Terror	Follows specific PvE rules (usually high recovery/low death).
Resource Gathering	Normal PvP rules apply if attacked on a tile.

3. The Hero Skill System

Every hero has two independent skill kits. Mythic heroes have 3 Expedition skills, while Epics have 2.

Expedition Manuals: Required to upgrade these skills. They are generally rarer than Exploration manuals and should be prioritized for your primary rally captains.
Star Level Gate: A hero's star level caps how high each skill can be leveled. You cannot have a Level 5 skill on a 1-star hero.

4. Rally Mechanics: Captain vs. Joiner

The Rally Captain (Lead)

The captain's squad must contain one hero of each class (Infantry, Lancer, Marksman).

Active Skills: All nine skills of the captain's three heroes are active (assuming 3x Mythic).
Stat Baseline: The captain provides the primary attack/defense/health bonuses for the entire rally.

The Rally Joiner (Support)

This is the most misunderstood system in the game.

Flag Hero Only: Only your slot-1 (flag) hero matters. Heroes in slots 2 and 3 contribute nothing.
First Skill Only: Only your slot-1 hero's first Expedition skill is active.
The 4-Buff Cap: A rally can only hold 4 joiner contributions. The system automatically selects the 4 highest-leveled first-skills among all joiners.

[!IMPORTANT] Joiner quality > Joiner count. A rally with four Level 5 first-skills is identical to one with forty Level 5 first-skills. Coordination is key.

5. Garrison and Reinforcement

Garrison battles follow a hybrid set of rules:

One Anchor Defender: The player with the highest stat bonuses is chosen as the source for all defense bonuses.
Support Reinforcers: Like rallies, the first Expedition skill of up to four other garrison members' lead heroes will activate.

6. The Labyrinth: Structured PvE

The Labyrinth is the ultimate benchmark for Expedition stats. It unlocks at Furnace Level 19 via the Command Center.

Zone Schedule

Day	Zone	Primary Stat Source
Mon-Tue	Land of the Brave	Heroes & Hero Gear
Wed-Thu	Cave of Monsters	Pets & Pet Skills
Wed-Thu	Glowstone Mine	Chief Charms
Fri-Sat	Earthlab	Research & War Academy
Fri-Sat	Dark Forge	Chief Gear
Sun	Gaia Heart	Everything Personal

Combat Rules

Labyrinth Explorers supply Level 10 troops (except in Gaia Heart). Your city's troop tier doesn't matter; your hero/gear investment does.
Gaia Heart allows you to use your own troops without casualty risk.
Instant Clear: Unlocks at Stage 10 for each zone.

7. The January 2026 Rework

In January 2026, the combat engine was reworked to shift focus from Stuns to Lethality and Damage Dealt.

Stun chance is now less impactful than Lethality (converting more damage to permanent kills).
Any hero guide written before 2026 should be checked against current in-game tooltips, as many kits were adjusted during this transition.

For practical advice on which heroes to use in these roles, see the Expedition Lineup Guide.

Whiteout Survival Expedition Guide [2026] — Complete Mechanics Reference