Within 49 Drone Test
What the 49 Drone Test Still Left Unanswered
The test showed a credible live-fire effect, but it did not settle how Leonidas performs against varied drones, weather, terrain or sustained combat use.
On this page
- Unknown drone hardening and shielding
- Weather terrain and electromagnetic clutter
- Repeated engagements and adversary adaptation
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Introduction
The Camp Atterbury demonstration showed something important: Leonidas could disable a large group of drones in a live-fire event, including a highly publicised engagement against a 49-drone swarm. That was a meaningful proof of capability for a high-power microwave (HPM) counter-drone system. However, military demonstrations rarely answer every operational question. The event established that Leonidas can generate a significant effect under the conditions tested, but it did not establish how reliably that effect would translate across the full range of battlefield environments, drone designs, weather conditions, and prolonged combat operations that real-world forces face. [Epirus]epirusinc.comTap to unmute.Read moreEpirusEpirus' Leonidas High-Power Microwave Defeats 49-Drone…10 Sept 2025 — Leonidas neutralized 61-of-61 drones, culminating in a 49…
Understanding those limits is essential. The most valuable lesson from Camp Atterbury may not be what the test proved, but what remained unknown afterward.
Unknown Drone Hardening and Shielding
One of the largest unanswered questions concerns the drones themselves.
Epirus reported that the final swarm consisted of two representative drone types and that all 61 drones flown during the event were successfully defeated across five scenarios. That demonstrates effectiveness against those specific targets. It does not automatically demonstrate equivalent effectiveness against every drone architecture an adversary might field. [Epirus]epirusinc.comTap to unmute.Read moreEpirusEpirus' Leonidas High-Power Microwave Defeats 49-Drone…10 Sept 2025 — Leonidas neutralized 61-of-61 drones, culminating in a 49…
High-power microwave systems work by coupling electromagnetic energy into electronic components and disrupting or damaging them. The degree of vulnerability depends on numerous design factors, including:
- Wiring layouts and cable lengths.
- Electronic shielding measures.
- Component selection and hardening.
- Internal redundancy.
- Flight-control architecture.
- Physical orientation relative to the incoming energy.
Different drones may therefore respond very differently to the same microwave pulse. A commercial-style quadcopter, a purpose-built military drone, and a specially hardened unmanned system may not exhibit the same susceptibility. Research on microwave effects against electronics consistently shows that outcomes depend heavily on how energy couples into specific electronic pathways rather than on a simple universal “on or off” vulnerability. [arXiv]arxiv.orgA Multi-physics Simulation Framework for High-power Microwave Counter-unmanned Aerial System Design and Performance EvaluationFebrua…
Camp Atterbury demonstrated effectiveness against the drones flown that day. It did not establish a universal kill probability against future or more heavily protected designs.
Weather, Terrain and Electromagnetic Clutter
The demonstration also did not settle how Leonidas performs across the full spectrum of operational environments.
Live-fire tests necessarily occur under particular environmental conditions. Yet military forces may need to defend against drones in deserts, coastal regions, mountains, forests, dense urban areas, and maritime settings. Each environment presents different challenges.
Several variables remain largely unanswered by the public evidence:
- Performance during heavy rain, snow, fog or severe atmospheric conditions.
- Effects of terrain masking in hilly or mountainous environments.
- Interactions with dense urban infrastructure.
- Operations near large concentrations of electronic emitters.
- Performance amid battlefield electromagnetic congestion.
The Camp Atterbury event showed successful engagements in a controlled test range environment. It did not provide publicly available evidence about how the system behaves when terrain obstructs lines of engagement, when targets emerge from complex urban canyons, or when numerous friendly and hostile emitters compete for electromagnetic space. [Axios]axios.comThe event highlighted a significant advancement in counter-drone technology amid growing global security concerns over drone swarms, whic…
This distinction matters because modern conflicts increasingly occur in environments crowded with sensors, radios, networks and autonomous systems. A weapon that performs exceptionally on a test range may still face integration and effectiveness challenges in more complex operational settings.
Repeated Engagements and Adversary Adaptation
The Camp Atterbury demonstration was also a snapshot in time rather than a test of sustained combat endurance.
The event involved five scenarios and 61 drones in total, culminating in the 49-drone swarm engagement. That is substantial for a demonstration, but it is not the same as weeks or months of operational deployment against a determined opponent. [Epirus]epirusinc.comTap to unmute.Read moreEpirusEpirus' Leonidas High-Power Microwave Defeats 49-Drone…10 Sept 2025 — Leonidas neutralized 61-of-61 drones, culminating in a 49…
Several questions therefore remain unresolved:
How does performance hold up during repeated engagements?
A military system may need to conduct dozens or hundreds of engagements over an extended period. Public reporting from the demonstration does not reveal long-term operational data regarding maintenance demands, reliability rates, component wear or sustained sortie generation.
How quickly can the system respond to sequential attacks?
A successful engagement against one swarm does not automatically demonstrate effectiveness against multiple waves arriving over time or from widely separated directions.
What happens when adversaries adapt?
History suggests that every successful defensive technology eventually triggers countermeasures. Drone designers may experiment with improved shielding, altered electronics, distributed swarm behaviours, sacrificial decoys or tactics intended to complicate microwave engagements. The Camp Atterbury event could not demonstrate how Leonidas would perform against future adaptations that have not yet appeared. [Wikipedia]WikipediaEpirus LeonidasEpirus Leonidas
Military technology competitions are dynamic rather than static. Demonstrating success against today’s threat does not automatically prove superiority against tomorrow’s version of that threat.
What the Demonstration Could Not Say About Battlefield Reliability
A common misunderstanding is that a successful demonstration automatically validates battlefield performance.
In reality, military acquisition programmes often progress through multiple stages precisely because demonstrations answer only part of the overall question. The U.S. Army’s continued investment, prototype deployments and operational experimentation reflect the fact that decision-makers still need evidence from broader testing and real-world use. Public reporting indicates that Leonidas prototypes have been delivered for Army evaluation and that some systems have been deployed for operational assessment, suggesting that further validation remains necessary beyond demonstration events. [Wikipedia]WikipediaEpirus LeonidasEpirus Leonidas
The Camp Atterbury results therefore did not prove:
- Reliability across all drone classes.
- Performance against hardened or specially protected systems.
- Effectiveness under every weather condition.
- Consistent operation across all terrain types.
- Long-term sustainment in continuous combat.
- Resistance to future adversary countermeasures.
- Universal battlefield success rates.
The Real Open Question
The most accurate interpretation of Camp Atterbury is not that Leonidas was proven ineffective, nor that it was proven universally effective.
Instead, the demonstration established a credible and highly visible proof that a high-power microwave system can defeat a large drone swarm under operationally relevant test conditions. What remains unresolved is how broadly that success can be generalised.
The event answered the question, “Can Leonidas disable dozens of drones at once?” with strong evidence that it can. It left unanswered the more difficult question that matters most to military planners: “How consistently can it do so across the unpredictable conditions of real warfare?” [Epirus+2Axios]epirusinc.comTap to unmute.Read moreEpirusEpirus' Leonidas High-Power Microwave Defeats 49-Drone…10 Sept 2025 — Leonidas neutralized 61-of-61 drones, culminating in a 49…
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Endnotes
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Source: axios.com
Link: https://www.axios.com/2025/08/28/epirus-indiana-drone-swarm-demo-leonidasSource snippet
The event highlighted a significant advancement in counter-drone technology amid growing global security concerns over drone [swarms]({{ 'swarms/' | relative_url }}), whic...
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Source: arxiv.org
Link: https://arxiv.org/abs/2602.08477Source snippet
A Multi-physics Simulation Framework for High-power Microwave Counter-unmanned Aerial System Design and Performance EvaluationFebrua...
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Source: Wikipedia
Title: Epirus Leonidas
Link: https://en.wikipedia.org/wiki/Epirus_Leonidas -
Source: youtube.com
Title: The Microwave Cannons Built to Stop Drone Swarms
Link: https://www.youtube.com/watch?v=S5GLxs7U5lkSource snippet
Epirus' Leonidas High-Power Microwave Neutralizes 61-of-61 Drones Across 5 Flight Scenarios...
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Source: youtube.com
Link: https://www.youtube.com/watch?v=na0pGfopahMSource snippet
Drone Swarms Are Here. This Technology Could Stop Them...
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Source: epirusinc.com
Title: Tap to unmute.Read more
Link: https://www.epirusinc.com/press-releases/epirus-leonidas-high-power-microwave-defeats-49-drone-swarm-100-of-drones-flown-at-live-fire-demonstrationSource snippet
EpirusEpirus' Leonidas High-Power Microwave Defeats 49-Drone...10 Sept 2025 — Leonidas neutralized 61-of-61 drones, culminating in a 49...
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Source: facebook.com
Link: https://www.facebook.com/militarymechanicsie/posts/epirus-leonidas-agv-combines-autonomous-mobility-with-microwave-counter-drone-te/122293849676191911/Source snippet
em, successfully disabling a swarm of 49 quadcopters in seconds.Read more...
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Source: unmannedairspace.info
Title: epirus leonidas defeats 49 drone swarm with one electromagnetic burst
Link: https://www.unmannedairspace.info/counter-uas-systems-and-policies/epirus-leonidas-defeats-49-drone-swarm-with-one-electromagnetic-burst/Source snippet
Epirus' Leonidas defeats 49-drone swarm with one...2 Sept 2025 — Epirus has successfully demonstrated its Leonidas counter-drone system...
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Source: youtube.com
Link: https://www.youtube.com/watch?v=ZrkopSw5uasSource snippet
100% successful against drones flown...
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Source: youtube.com
Link: https://www.youtube.com/watch?v=f-_GR0be6FESource snippet
In Indiana Axios. 254 views · 4 months ago...more...
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Source: inss.org.il
Title: innovative systems for neutralizing drone and uav swarms
Link: https://www.inss.org.il/social_media/innovative-systems-for-neutralizing-drone-and-uav-swarms/Source snippet
Epirus released new documentation showing that its Leonidas system successfully intercepted a swarm of 49 drones simultaneously. The...R...
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Source: linkedin.com
Link: https://www.linkedin.com/posts/epirus_epirus-leonidas-high-power-microwave-defeats-activity-7371575751776608256-i0zZSource snippet
tic interference. “We believe showcasing our weaponized...
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Source: wordpress-1555235-6025816.cloudwaysapps.com
Title: epirus leonidas system downs 49 drones in swarm test
Link: https://wordpress-1555235-6025816.cloudwaysapps.com/content/epirus-leonidas-system-downs-49-drones-in-swarm-test/Source snippet
Leonidas system downs 49 drones in swarm testThe system uses directed energy in the form of high-power [microwaves]({{ 'microwaves/' | relative_url }}) to disable or damage on...
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Source: defenceredefined.com.cy
Title: epirus leonidas defeats 49 drone swarm with one electromagnetic burst
Link: https://defenceredefined.com.cy/epirus-leonidas-defeats-49-drone-swarm-with-one-electromagnetic-burst/Source snippet
Epirus | Leonidas Defeats 49-Drone Swarm with One...Sep 14, 2025 — Epirus has successfully demonstrated its Leonidas counter-drone syste...
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Source: norskluftvern.com
Title: epirus leonidas counter drone system us
Link: https://norskluftvern.com/2025/03/31/epirus-leonidas-counter-drone-system-us/Source snippet
Epirus Leonidas Counter-Drone System (US)31 Mar 2025 — Neutralization Method: High-power microwave (HPM) pulses disrupt drone electronics...
Additional References
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Source: facebook.com
Title: on august 26 2025 at camp atterbury in indiana us defense contractor epirus test
Link: https://www.facebook.com/techtimespage/posts/on-august-26-2025-at-camp-atterbury-in-indiana-us-defense-contractor-epirus-test/787324270769980/Source snippet
The US military successfully tested Leonidas, a high- power microwave weapon capable of neutralizing drones in seconds. In one trial, the...
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Source: twz.com
Title: army puts 50m bet on next gen leonidas high power microwave counter drone tech
Link: https://www.twz.com/land/army-puts-50m-bet-on-next-gen-leonidas-high-power-microwave-counter-drone-techSource snippet
The War ZoneArmy Puts $43M Bet On Next Gen Leonidas High Power...17 Jul 2025 — Epirus' CEO says successful tests of the company's Gen II...
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Source: newsflare.com
Title: The Epirus Leonidas works by firing its high-power microwave weapon to disable
Link: https://www.newsflare.com/video/792400/jaw-dropping-new-weapon-knocks-dozens-of-attacking-drones-out-of-skySource snippet
Jaw-dropping new weapon knocks dozens of attacking drones...In one dramatic test, they demonstrated defeating 49 drones at the same time...
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Source: evrimagaci.org
Title: leonidas microwave weapon downs drone swarm in indiana 495469
Link: https://evrimagaci.org/gpt/leonidas-microwave-weapon-downs-drone-swarm-in-indiana-495469?srsltid=AfmBOopOxs7I_g5PMJpwTmGsYec8PWe91X6H-9YqJ7dT6yCDWjPHt75ySource snippet
Leonidas Microwave Weapon Downs Drone Swarm In...29 Aug 2025 — Demonstrate Leonidas, Epirus's high-powered microwave weapon, successfull...
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Source: evrimagaci.org
Title: leonidas microwave weapon downs drone swarm in indiana 495469
Link: https://evrimagaci.org/gpt/leonidas-microwave-weapon-downs-drone-swarm-in-indiana-495469?srsltid=AfmBOopo9CRJnaR1vSy2w5Z5KsOh3-00DWRbsE5cBZghkXbSrYKHUvjvSource snippet
Leonidas Microwave Weapon Downs Drone Swarm In...29 Aug 2025 — Demonstrate Leonidas, Epirus's high-powered microwave weapon, successfull...
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Source: tomshardware.com
Title: The demonstration attracted representatives from the U.S
Link: https://www.tomshardware.com/tech-industry/high-power-microwave-system-downs-49-drones-in-[one-shotSource snippet
Department of Defense, other government agencies, and nine allied nations. It showcased strategic features such as multi-angle engagement...
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Source: facebook.com
Link: https://www.facebook.com/techtimespage/posts/the-us-military-has-announced-the-successful-test-of-the-leonidas-high-power-mic/916037894565283/Source snippet
rowave (HPM) system, which disabled a record-breaking 49...Read more...
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Source: facebook.com
Link: https://www.facebook.com/avweek/posts/singapores-defense-science-and-technology-agency-and-us-based-epirus-have-signed/1343371494500750/Source snippet
uccessfully disabling a swarm of 49 quadcopters in seconds.Read more...
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Source: instagram.com
Link: https://www.instagram.com/reel/DWjefMaoiz8/?hl=enSource snippet
er communication stability compared to traditional RF-based drones...
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Source: facebook.com
Link: https://www.facebook.com/unboxfactory/posts/the-us-military-has-successfully-tested-a-next-generation-high-power-microwave-h/944338644583853/Source snippet
rowave (HPM) weapon capable of disabling dozens of drones at once...
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