Helldivers 2 Defense Missions: Double Mortar Strategy for High Difficulty Victories

【Helldivers 2 Strategy Guide】

Mission Type: Defense ("Evacuate High-Value Assets", etc.)
Recommended Difficulty: 7 (Suicide Mission) or higher
Estimated Duration: Approx. 15-30 minutes

Helldivers 2 does not have a fixed "season" system. Content is regularly added in the form of "Warbonds". The most recent major free update, "Machinery of Oppression", was released on February 10, 2026. This article is based on information as of June 12, 2026.

Hordes of enemies swarming from all directions, defense objectives being destroyed, and comrades falling one after another... Many Helldivers have surely felt despair facing the high difficulties of defense missions like "Evacuate High-Value Assets". But it's too early to give up hope. The 'Double Mortar Strategy' introduced in this article, by combining proper Sentry placement and role division, can turn the tide of desperate battles and lead you to victory. Now, for the triumph of Managed Democracy, let's build the ultimate defense!

Defense Mission Basics and the 'Double Mortar Strategy'

The objective of defense missions is to protect "high-value assets" like civilians or research data from relentless enemy assaults until a specified time or number of evacuees is reached. Success requires strategic thinking to impede enemy advances and efficiently control areas, more so than individual combat prowess. The most effective approach for this is the 'Double Mortar Strategy', which combines two types of Mortar Sentries.

The Core of the Strategy: The Impenetrable Synergy of EMS and Mortar Sentries

The stars of this strategy are two Sentries that can be called in via Stratagem: the "A/M-23 EMS Mortar Sentry" and the "A/M-12 Mortar Sentry". Operating these two simultaneously unleashes astonishing defensive capabilities.

1. Stun and Neutralize: First, the "A/M-23 EMS Mortar Sentry" deploys an electromagnetic field around its impact point, almost permanently stunning enemies within its radius. This neutralizes troublesome attacks like Charger rushes and Bile Spewer acid sprays, completely halting enemy advances.
2. Annihilation from Safety: While enemies are immobilized, the "A/M-12 Mortar Sentry" rains down explosive shells. Since enemies cannot move, they are unilaterally subjected to continuous attacks, allowing for safe and efficient elimination of enemy groups.

This powerful synergy is why the Double Mortar Strategy shines in high difficulties. It can neutralize not only small enemies but also medium-sized Stalkers and Devastators en masse, dramatically improving the stability of your defensive line.

The Key to Success: Optimal Sentry Placement

To maximize the effectiveness of the Double Mortar Strategy, Sentry placement is paramount. Mortar-type Sentries have the significant advantage of firing shells in an arc, allowing them to attack locations not directly in their line of sight. Utilizing this characteristic, the basic tactic is to place them in safe positions where they are difficult for enemies to destroy.

Sentry Placement Selection Steps

Follow these steps to find optimal placement locations:

1. Utilize Cover: Look for locations around the mission objective (the central area with the evacuation button, etc.) that are out of the enemy's direct line of sight, such as behind large rocks or buildings. Placing Sentries here significantly reduces the risk of destruction from enemy gunfire or charges.
2. Consider Enemy Reinforcement Directions: Anticipate the direction from which enemy reinforcement pods (dropships) will arrive and choose a position from which shells can efficiently reach that direction. However, you must also consider the team's overall positioning to avoid friendly fire within the shelling area.
3. Appropriate Dispersion: If Sentries are placed too close together, there's a risk of them being destroyed simultaneously by a Bile Titan's area attack or a single Automaton rocket. While EMS Mortar and Mortar Sentries are used as a set, try to place them a few meters apart to minimize damage.

Specific Considerations for Automaton Combat

Sentry survivability is even more crucial in Automaton combat than in Terminid combat. Rocket Devastators and Rocket Troopers deployed from Fabricators, in particular, will accurately snipe Sentries from long range. If you don't thoroughly utilize walls and rock formations to completely hide the Sentry itself from enemy lines of sight, your defensive line will quickly collapse.

Ideal Role Assignments for a 4-Person Squad

Even powerful tactics won't work without team coordination. To consistently clear high-difficulty defense missions, it's essential for each Helldiver to understand and perform their role. Below are the ideal role assignments for a 4-person squad.

Sentry Specialists (2 players)

This role is the cornerstone of the team's defensive line. At least one player should equip the "A/M-23 EMS Mortar Sentry" and the other the "A/M-12 Mortar Sentry", prioritizing keeping both Sentries active on the map at all times. Stratagem cooldown management is extremely important, so equipping armor with cooldown reduction effects is also effective. To handle the few enemies that break through the defensive line, it's advisable to carry close-range weapons with high responsiveness, such as the "SG-225 Breaker" shotgun or the "SMG-37 Defender".

Anti-Armor Specialists (2 players)

While Mortar Sentries are powerful, they struggle to quickly eliminate heavily armored enemies like Chargers, Bile Titans, and Hulks on their own. The role of the Anti-Armor Specialists is to eliminate these threats. By continuously calling in the "EAT-17 (Expendable Anti-Tank)"—which has a very short Stratagem cooldown—and always having spares deployed on the map, you can ensure an immediate response when large enemies appear. The "GR-8 Quasar Cannon" is also a strong option, but its required charge time makes coordination with teammates even more crucial. By quickly dealing with large enemies, Anti-Armor Specialists allow Sentry Specialists to focus on maintaining the defensive line.

Other Powerful Sentries for Specific Situations

While the Double Mortar Strategy is fundamental, other Sentries can be effective depending on mission conditions and terrain.

A/G-16 Gatling Sentry

Its appeal lies in its immense rate of fire, capable of instantly clearing swarms of small to medium-sized enemies. However, it does not distinguish between friend and foe along its firing axis, making friendly fire extremely dangerous. It must always be placed on high ground away from team members' active areas or on flanks where firing lines do not intersect, taking extreme caution not to send teammates to hell.

Incendiary Sentry

Recent updates have enhanced its range and damage, making it a very powerful option in specific situations. When placed in narrow passages (choke points) where enemy invasion routes are funnelled, it creates a wall of fire that can completely shut down enemy advances. It is well worth considering if the terrain allows you to restrict enemy movement.

A/AC-8 Autocannon Sentry

It is highly effective against medium-armored enemies like Devastators and Hive Guards. However, it suffers from high ammunition consumption, requiring reloads, and slow turret traverse speed. It is best used only when enemy spawn locations are predictable and you want to defend a specific direction intensively.

Summary

High-difficulty defense missions in Helldivers 2 cannot be cleared by luck or individual skill alone. By basing your strategy on the 'Double Mortar Strategy' explained in this article and thoroughly implementing the following three points, you will pave the way to consistent victory.

• Understand the Synergy: Stun with the "A/M-23 EMS Mortar Sentry" and annihilate with the "A/M-12 Mortar Sentry". Master this fundamental principle.
• Strategic Placement: Maximize the use of cover to protect Sentries from enemy attacks and enhance their survivability.
• Clear Role Assignments: "Sentry Specialists" and "Anti-Armor Specialists" focus on their respective roles and coordinate to eliminate threats.

By mastering this strategy, you will be able to efficiently eliminate the endless enemies of democracy and perfectly defend high-value assets. Coordinate with your comrades and report a glorious victory to Super Earth!