Last War Survival Zombie Siege: How to Defend & Win Every Battle

The Zombie Siege is one of the most intense and rewarding events in Last War Survival game, but it’s also where many players fall short. Each wave grows tougher, and without the right setup, you’ll burn through troops fast or miss out on key rewards.

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In this guide, we’ll walk you through everything you need to survive and thrive in Zombie Siege—from building a strong defense and choosing the right heroes, to coordinating reinforcements with your alliance and climbing through Siege levels efficiently.

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Whether you’re a new player trying to figure out what Zombie Siege even is, or a mid-to-late game survivor looking to rank higher and take fewer losses, this guide is packed with strategies you can actually use…

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So let’s break it all down.

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What Is the Zombie Siege in Last War Survival?

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Zombie Siege is a recurring PvE event in Last War Survival where waves of undead attack player bases. Each Siege level has 20 waves, with each wave lasting 30 seconds and a short break in between.

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As the waves progress, the zombies become stronger and more varied—putting your defenses, hero lineup, and coordination skills to the test.

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While the zombies don’t behave like regular PvP enemies, they can still burn your base if you're unprepared. Once a base is hit and starts burning, it won’t be attacked again during that round, but it also won’t contribute to the alliance's defense anymore.

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That’s why survival isn’t just personal—it affects your entire alliance's performance.

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You don’t just play to survive, either. Zombie Siege rewards are tied to how many waves your alliance successfully repels. The more waves you survive together, the better the rewards for both individuals and the alliance as a whole.

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To move on to the next difficulty level, you’ll also need to collect radar clues, which are earned through radar missions between Sieges.

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So, in short: Last War Survival Zombie Siege is not just a solo endurance test—it’s a strategic alliance event with meaningful rewards and consequences.

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How to Prepare for Zombie Siege Mode

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If you want to survive all 20 waves of the Zombie Siege and help your alliance rank high, preparation is everything.

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This event isn’t just about throwing your strongest heroes into battle—it’s about coordination, smart defense setups, and making sure everyone in the alliance is ready.

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The first and most important step is to set your defense squad. Many players forget to assign even one squad to defend, and when the zombies show up, their base burns instantly.

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It’s also smart to coordinate with your alliance ahead of time. Let your members know when the siege is starting so everyone can set their defense.

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Stronger players should consider reinforcing weaker members, especially those who are newer or haven’t built up their squads yet. Reinforcing other players helps the whole alliance last longer, especially in the final waves when zombie pressure intensifies.

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If you’re not sure which heroes to assign to your defense squad, check out our Last War Survival Hero Tier List to see which heroes perform best in defensive roles. 

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As you prepare for the siege, make sure you’ve taken care of these essentials:

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• Train enough troops to fill your defense squads and support reinforcements.
• Upgrade your base defenses — turrets, wall durability, and traps all help absorb damage from zombie waves.
• Level up your research in relevant trees like Base Defense, Troop Resistance, and Hero Power.
• Choose the right heroes — focus on defensive units and AoE damage dealers who can handle large zombie clusters.

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One more thing: to unlock higher siege levels, you’ll need to collect Clues, which are earned by completing Radar missions.

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There’s a cooldown period between each event cycle, giving you time to gather clues before advancing to the next level. If a stage feels too difficult, you can always repeat the previous level until your team is better prepared.

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Best Heroes & Troops for Zombie Siege

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Surviving the later waves of Zombie Siege comes down to having the right heroes and troop composition. You’re not just fighting a few mindless enemies—zombies come in waves, grow stronger, and can overwhelm you quickly if your defense isn’t solid.

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So, what kind of heroes work best? Generally, you’ll want to prioritize heroes with strong AoE (area of effect) skills, defensive buffs, and high survivability.

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These are the ones who can hold the line while also clearing multiple enemies at once. Heroes like Kimberly, Tesla, and Williams are strong picks due to their ability to either deal widespread damage or protect the frontline.

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And when it comes to troops, balance is key. You’ll need Infantry to hold the line, Missile Vehicles for long-range damage, and Aircraft for mobility and precision hits. Make sure your formation includes all three, and adjust ratios depending on your hero setup.

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If you’re not sure how to structure your formation or which heroes work best together, check out our guide on the Best Squad Lineup in Last War Survival to Dominate Every Battle.

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Another often-overlooked factor? Reinforcements. Ask your alliance to back you up with strong squads if your team is still developing. One or two high-level reinforcements can often be the difference between surviving Wave 19 or getting knocked out in Wave 14.

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5 Winning Strategies for Higher Siege Ranks

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If you’re aiming to climb the Zombie Siege leaderboard and walk away with better rewards, it's not just about surviving—it's about surviving smart.

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Top players don’t rely on brute force alone. They prepare ahead of time, coordinate with their alliance, and use a few key tactics to stay in the game longer and rack up points.

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1. Time Your Reinforcements Wisely

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Sending reinforcements isn’t just a matter of generosity—it’s strategy. Before the siege begins, communicate with your alliance. Identify weaker players who might struggle to hold off zombie waves alone.

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Reinforcing them early—especially during later waves—can keep them from being eliminated and help your alliance secure more total wave clears.

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The earlier you react, the fewer troops you’ll need to save the base.

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2. Defense Lineups Matter

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Every player should have at least one solid squad set in their defense lineup before the first wave hits. It doesn’t have to be your best squad, but it needs to be strong enough to survive the early rounds.

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Players without a defense lineup are sitting ducks. Once their base is attacked and burns, they’re out—and that’s one less wave your alliance can survive together.

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3. Pay Attention to Wave Gaps

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Between each zombie wave, there’s a short pause. Don’t waste it. Use that time to check which members are taking heavy hits, who’s burning, and who’s next in line for a wave.

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It’s the perfect moment to send in last-minute reinforcements, rotate formations, or adjust your own defense if needed. A few quick moves between waves can make all the difference.

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4. Don’t Burn Out Too Early

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Blasting all your strongest heroes and reinforcements in the first few waves might feel powerful—but Zombie Siege is a marathon, not a sprint. Some of the toughest enemies come in the later stages, and if your key squads are already wiped, you’ll struggle to recover.

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Pacing your support, rotating heroes, and saving critical reinforcements for waves 15–20 is how top players stay alive and effective to the very end.

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5. Aim for Group Survival, Not Just Personal Score

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Zombie Siege is an alliance event. The more waves your alliance clears together, the better everyone’s rewards. That means helping others—even if it means sacrificing some troops to reinforce someone else.

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Keeping more members alive longer boosts your alliance’s overall performance. It’s not about having one MVP—it’s about getting as many people as possible to the final wave.

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If you're looking for extra ways to stay ahead of the competition, here are 7 Unconventional Tips to Dominate Last War Survival Game.

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How to Speed Up Progress & Strengthen Your Siege Defense

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Surviving the Zombie Siege is one thing, and being fully prepared for the next one is what sets top players apart.

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But here’s the truth: upgrading key heroes, unlocking defensive gear, and speeding up troop training can get expensive fast—especially if you’re buying packs directly through the game.

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That’s where Packsify makes a difference.

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Instead of paying full price for hero fragments, speed-ups, or resource bundles, you can get the exact same packs for up to 35% less.

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No extra steps. No shady workarounds. Just a smarter way to top up and stay ready.

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So if you’re serious about building stronger defenses, leveling up faster, and staying competitive during Zombie Siege events and beyond…

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Download Packsify on Google Play if you’re on Android, or…

Use the Packsify web version here if you’re on iOS (App coming soon!)

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Because the next wave is coming—and you’ll want to be ready.