Zombie Siege Guide

What Is Zombie Siege?

Zombie Siege is a large-scale alliance defence event where your alliance must survive 20 escalating waves of zombie attacks. Every member's base is targeted by progressively stronger zombies. The more waves your alliance survives collectively, the better the rewards for everyone.

Alliance Event, Not Solo

Zombie Siege rewards alliance-wide survival, not individual performance. Keeping weaker members alive through reinforcements earns more total rewards than one strong player surviving alone. Think team, not self.

How It Works

Event Structure

R4 or R5 officers select the difficulty level to start the event
Zombies attack in 20 waves of increasing strength, each wave lasting approximately 30 seconds
Every alliance member's base is attacked simultaneously
Each member gets 2 failed defences before being knocked out entirely — your base must be breached twice before elimination
At higher difficulties (level 3+), multiple zombie groups attack simultaneously per wave
From Difficulty 7, special Zombie Strikers may appear on waves 4, 8, 12, 16, and 20 — defeating them grants extra rewards
Shields do not work — zombie attacks bypass shields entirely. Do not waste resources activating them
The event rewards are based on how many waves your alliance clears collectively

Wave Progression

WavesDifficultyWhat to Expect

Waves 1-5LowBasic zombies in high numbers but low individual threat. Most players survive easily

Waves 6-10MediumElite zombies appear with increased damage. Weaker players start struggling

Waves 11-15HighBoss zombies with extreme threat. Reinforcements become critical for mid-tier players

Waves 16-20ExtremeMaximum difficulty. Only well-geared players or reinforced bases survive without losses

Zombie Power Per Wave (All 20 Waves, Every Difficulty)

This chart gives the approximate per-group zombie power for every wave (1–20) at each difficulty level, so you can judge wave by wave whether your wall will hold. Levels 1–7 are community estimates cross-referenced across multiple sources; Levels 8–12 are extrapolated from the same scaling trend, since no public figures exist for the higher tiers yet. The game doesn't publish exact wave power, so treat all of it as a planning guide and confirm against your own client — especially Levels 8+. Power scales with both the wave and the difficulty you pick.

Levels 1–7 — per-group power (millions):

Wave	Lvl 1	Lvl 2	Lvl 3	Lvl 4	Lvl 5	Lvl 6	Lvl 7
1	0.78M	1.1M	1.43M	1.95M	2.28M	2.28M	3.58M
2	0.89M	1.25M	1.62M	2.21M	2.58M	2.58M	4.06M
3	0.99M	1.4M	1.81M	2.48M	2.89M	2.89M	4.54M
4	1.09M	1.55M	2.01M	2.74M	3.19M	3.19M	5.02M
5	1.2M	1.7M	2.2M	3.0M	3.5M	3.5M	5.5M
6	1.46M	2.06M	2.66M	3.6M	4.3M	4.3M	6.6M
7	1.72M	2.42M	3.12M	4.2M	5.1M	5.1M	7.7M
8	1.98M	2.78M	3.58M	4.8M	5.9M	5.9M	8.8M
9	2.24M	3.14M	4.04M	5.4M	6.7M	6.7M	9.9M
10	2.5M	3.5M	4.5M	6.0M	7.5M	7.5M	11.0M
11	2.7M	3.8M	4.9M	6.6M	8.2M	8.2M	12.0M
12	2.9M	4.1M	5.3M	7.2M	8.9M	8.9M	13.0M
13	3.1M	4.4M	5.7M	7.8M	9.6M	9.6M	14.0M
14	3.3M	4.7M	6.1M	8.4M	10.3M	10.3M	15.0M
15	3.5M	5.0M	6.5M	9.0M	11.0M	11.0M	16.0M
16	3.7M	5.3M	6.9M	9.5M	11.6M	11.6M	17.1M
17	3.9M	5.7M	7.3M	10.0M	12.2M	12.2M	18.2M
18	4.1M	6.0M	7.7M	10.5M	12.8M	12.8M	19.2M
19	4.3M	6.4M	8.1M	11.0M	13.4M	13.4M	20.3M
20	4.5M	6.7M	8.5M	11.5M	14.0M	14.0M	21.4M

Levels 8–12 — per-group power (millions, extrapolated — confirm in-game):

Wave	Lvl 8	Lvl 9	Lvl 10	Lvl 11	Lvl 12
1	~4.8M	~6.3M	~8.1M	~11M	~14M
2	~5.5M	~7.2M	~9.3M	~12M	~16M
3	~6.1M	~8.0M	~10M	~13M	~17M
4	~6.7M	~8.8M	~11M	~15M	~19M
5	~7.4M	~9.6M	~13M	~16M	~21M
6	~9.0M	~12M	~15M	~20M	~26M
7	~11M	~14M	~18M	~23M	~30M
8	~12M	~16M	~21M	~27M	~35M
9	~14M	~18M	~23M	~30M	~40M
10	~15M	~20M	~26M	~34M	~44M
11	~17M	~22M	~28M	~37M	~48M
12	~18M	~23M	~30M	~39M	~51M
13	~19M	~25M	~32M	~42M	~55M
14	~20M	~27M	~34M	~45M	~58M
15	~22M	~28M	~37M	~48M	~62M
16	~23M	~30M	~39M	~50M	~65M
17	~24M	~31M	~41M	~53M	~69M
18	~25M	~33M	~43M	~56M	~72M
19	~27M	~35M	~45M	~58M	~76M
20	~28M	~36M	~47M	~61M	~79M

How to read this chart

Each figure is the power of one zombie group. Multiply by the number of groups for your difficulty to get the total power hitting your wall that wave: Level 1 = ×1 group, Levels 2–3 = ×2 groups, Levels 4–12 = ×3 groups (three groups is the cap). Example: Difficulty 4, Wave 15 = 9.0M × 3 groups = ~27M total. Your wall — your own troops plus any reinforcements — must withstand that combined hit. If your defence is well below a wave's total, drop a difficulty or call in reinforcements before it lands.

A note on Levels 8–12

Higher difficulties unlock gradually as your alliance banks Radar Clue points and your Warzone matures (Levels 11–12 opened up around the end of Season 3). No community source publishes exact power for these tiers, so the Level 8–12 figures above are an estimate that continues the observed scaling — use them for rough planning and confirm the real numbers in your own event. If you can share what you see in-game, we'll lock in exact values.

Pre-Event Preparation

Individual Preparation

Set your defence squad — this is the most important step. Many players forget to assign a defence squad and their base falls on wave 1
Recall all troops — all marches, gathering parties, and deployed squads must be back in your base before the event starts. At minimum, your strongest formation must be home
Select your strongest formation on your wall — make sure your best heroes and troops are assigned to base defence
Heal all wounded troops — you want maximum strength going into wave 1
Stop all other activities — do not send out gathering marches, rallies, drone missions, or any other deployments during the event

Alliance Coordination

Announce the start time — give members at least 30 minutes notice so they can prepare
Identify weak members — know who will need reinforcements before the event starts
Assign reinforcement duties — stronger players should know which weaker members they are responsible for reinforcing
Set up communication — have alliance chat or an external channel ready for real-time coordination

Defence Squad Reminder

Before every Zombie Siege, remind your alliance to set their defence squad. This is the number one cause of early eliminations. A simple reminder in alliance chat saves members from losing out on the entire event.

During the Event

For All Players

Stay online for the duration of the event if possible
Monitor your base health — if your defences are struggling, call for reinforcements in chat
Do not start other activities — no gathering, no rallies, no drone missions until the event ends
Heal troops between waves — use the gaps between waves to heal wounded troops

For Strong Players

Do not reinforce too early — early reinforcements can steal personal points from the player being reinforced. Let members defend on their own through the first waves
Reinforce from wave 10 onwards — once weaker members start struggling, send troops to garrison their bases
If you are knocked out, reinforce immediately — once your base is breached twice, send all remaining formations to support others
Prioritise reinforcing the weakest — a strong player surviving alone earns less for the alliance than keeping three weaker members alive through reinforcements
Communicate who you are reinforcing — avoid doubling up on the same base while leaving others unprotected

For Weaker Players

Ask for help early — do not wait until your base is about to fall. Request reinforcements before you need them
Accept all incoming reinforcements — do not accidentally reject garrison requests
Focus entirely on defence — no offensive actions, just survive

Rewards

Zombie Siege rewards are based on collective alliance performance:

Reward TypeDetails

Wave completionRewards increase with each wave cleared. Clearing all 20 waves gives the maximum payout

Individual survivalMembers who survive more waves earn more individual rewards

Zombie TokensSpecial event currency for exclusive purchases in the Zombie Siege shop

WrenchesConstruction parts (Wrenches) — useful for Marshal's Guard Drill Field donations. Schedule Zombie Siege on Mondays to use Wrenches before Alliance Duel

Standard rewardsDiamonds, hero EXP, drone parts, resources, and speedups

Alliance rewards are sent on Wednesday after reset. Personal rewards arrive by mail after the event ends.

Difficulty Selection

R4 and R5 officers choose the difficulty level (up to 12, unlocked progressively). The lower levels have a minimum HQ requirement; the higher tiers (8+) instead unlock as your alliance banks Radar Clue points and your Warzone matures. Wave-20 power per level (full per-wave figures are in the chart above):

DifficultyMin HQWave 20 Power

Level 1HQ 18~4.5M

Level 2HQ 20~6.7M (x2 groups)

Level 3HQ 22~8.5M (x2 groups)

Level 4HQ 24~11.5M (x3 groups)

Level 5HQ 26~14M (x3 groups)

Level 6HQ 28~14M (x3 groups)

Level 7HQ 29+~21.4M (x3 groups)

Levels 8–12Clue points~28M → ~79M (x3 groups, extrapolated)

Levels above 9 unlock gradually as your Warzone matures. Pick wisely:

Too easy: Your alliance clears all 20 waves but rewards are minimal
Too hard: Members get eliminated early and the alliance fails to clear later waves, missing out on the best rewards
Just right: Your alliance clears all 20 waves with some challenge in the later stages. This maximises total rewards

Start conservatively if you are unsure of your alliance's collective strength. It is better to clear all 20 waves at a lower difficulty than to fail at wave 15 on a higher one.

To unlock higher difficulty levels, your alliance must collect Radar Clue points between sieges by completing radar tasks — defeating Doom Legion members, zombie kills, ally assists, gathering, and digging.

Strategy Tips

Funnel defence resources to survival — the only thing that matters is keeping bases alive through 20 waves
Reinforce early, not late — waiting until a base is about to fall often means it is too late. Send reinforcements before wave 10
Coordinate reinforcement targets — avoid 5 strong players all reinforcing the same weak base while others go unprotected
Track eliminations — if a member is eliminated, their reinforcement troops return. Redirect those troops to someone else still fighting
Use the right hero composition for defence — tank heroes in front, damage dealers in back. Defence is about durability first
Do not panic on tough waves — later waves are supposed to be hard. Losing some troops is normal. Focus on keeping bases standing

Common Zombie Siege Mistakes

Not setting a defence squad — base falls on wave 1. Embarrassing and entirely preventable
Troops deployed elsewhere — gathering marches or rally troops away from base mean weaker defence
No reinforcements for weak members — strong players surviving solo while weak members fall early reduces total alliance rewards
Starting other activities during the event — rallies, gathering, and drone missions pull troops away from defence
Choosing too high a difficulty — alliance gets eliminated on wave 12 and misses waves 13-20 rewards
No communication — members do not know when the event starts, do not set their defence, or do not ask for help
Shields active — shields are disabled during the event. Activating them beforehand wastes resources

Alliance Leadership Checklist

1 hour before: Announce the start time and difficulty level in alliance chat
30 minutes before: Remind all members to set defence squads, recall troops, and stop other activities
At start: Confirm the event is running and remind members to stay online
Wave 5: Check in — is everyone surviving? Identify anyone struggling early
Wave 10: Deploy reinforcements to weak members. This is where eliminations start
Wave 15+: Focus all available reinforcements on keeping as many members alive as possible
Post-event: Review results, identify what worked and what to improve next time

Related Guides

Alliance Strategy Guide — alliance coordination and event management
Squad Building Fundamentals — building a strong defence squad
Daily Routine — planning your day around events