Division Stats and Combat
Section · Division Stats & Combat
Division Stats and Combat in Hearts of Iron IV
A plain-English look at division designer stats: what actually decides a land fight in HoI4, and what you can tweak later. This page is the section map; the deep dives live in the individual articles.
Section overview
Open the division designer in HoI4 and you get a wall of numbers. Those are your division stats. People also call them parameters or template stats — same thing: the values the game uses to resolve land combat.
What’s in here
- How a province fight works in Hearts of Iron IV
- Short cards on the main template stats
- A couple of practical ways to raise each important one
What’s not
- Full equipment tables and research trees
- Patch-by-patch “meta” templates
- A full deep dive on one stat — that’s what the articles are for
Where a new player should start
- How Combat Works — without this, designer numbers feel random.
- Then Attack and Defense & Armor — how you hit and how you stay in the fight.
- Then Survivability and Speed & Supply — why a template breaks or never arrives.
From experience: learn combat first, then tune stats to a role. Line infantry wants one package; a tank spearhead wants another. A “pretty” designer template with no job almost always lies to you.
How division combat works
Land combat in HoI4 isn’t a contest of “who has more Soft Attack in the tooltip.” It’s traded shots, a space limit on the province, and two pools: Organization and HP.
1) Who even gets to fight
Every province fight has a Combat Width cap. Each division takes space equal to its Combat Width. Overflow sits in reserve. Overfill the cap and you eat roughly −1% efficiency per 1% over, capped around −33%.
2) Attacks vs Defense or Breakthrough
Each hour, divisions throw attacks — Soft Attack and Hard Attack by the target’s hardness. On defense those hits are blocked by Defense; while attacking, by Breakthrough.
- While attacks are covered by Defense or Breakthrough, hit chance sits around 10%.
- Attacks past Defense or Breakthrough land closer to 40%.
Classic new-player trap: fat Soft Attack with no Breakthrough looks great in the designer and folds in the attack. High Defense with no Organization holds for a bit, then still walks off the tile.
3) Soft Attack, Hard Attack, and hardness
Target hardness decides how much of your fire counts as Soft Attack vs Hard Attack. Regular infantry is mostly soft — Soft Attack does the work. A tank fist is hard: without Hard Attack and Piercing, you’re missing the point of the fight.
4) Armor vs Piercing
The game compares the attacker’s Piercing to the target’s Armor. Enough Piercing and you deal full damage. Fall short and damage gets cut. Thresholds by piercing/armor ratio:
| Piercing / Armor | Damage share |
|---|---|
| ≥ 100% | 100% |
| ≥ 75% | 80% |
| ≥ 50% | 65% |
| below | 50% |
If your Armor beats their Piercing, you also take less — the armor contest cuts both ways.
5) How the fight ends
A division usually retreats when Organization hits zero — even if HP is still there. HP (men and gear) drains in parallel: that’s the warehouse bill. Terrain, supply, air, tactics, and Entrenchment stack modifiers on top, but the spine stays the same: attacks → blocked by Defense or Breakthrough → hits → damage to Organization and HP.
Practical takeaway: on the attack, watch Soft Attack or Hard Attack, Breakthrough, and Organization. On defense — Defense, Organization, and Combat Width. Everything else you tune to the enemy and the theater.
Offensive stats
The numbers that deal damage. Without them, the rest of the template is mostly window dressing.
Soft Attack
What it is. Attacks against low-hardness targets — mostly regular infantry. Players say Soft Attack; the UI frame is the same idea.
Why it matters. Main pressure stat into infantry lines. In single player it’s usually what decides how fast you shove a front.
Quick ways to raise it:
- Line artillery and an Artillery support company
- SPGs and rocket artillery in assault templates
- Newer guns and doctrines that push firepower
More in the article on Soft Attack.
Hard Attack
What it is. Attacks against high-hardness targets: tanks, mechanized divisions, “hard” templates.
Why it matters. Without it, Soft Attack alone struggles into armor. You don’t always need it — vs naked AI infantry, Soft Attack often covers it.
Quick ways to raise it:
- AT guns, tank destroyers, tank guns built for Hard Attack
- Anti-Tank support company
- Don’t forget Piercing: Hard Attack without Piercing underperforms into Armor
More in the article on Hard Attack.
Air Attack
What it is. Division AA: how your AA and SPAA answer planes over the fight.
Why it matters. Cuts CAS damage (cap around 75%), shoots planes in combat, and softens the enemy air superiority penalty. It won’t save factories from strategic bombers and it doesn’t replace fighters.
Quick ways to raise it:
- Anti-Air support company — usually the first move
- Newer AA guns by year
- SPAA or an AA module on tanks if the enemy owns the sky
More in the article on Air Attack.
Defense & Armor
Stats that soak incoming attacks and fight the piercing contest. For a defensive template, this is half the story.
Defense
What it is. How many enemy attacks the division covers while defending.
Why it matters. Covered attacks hit rarely (~10%). Past Defense, you’re closer to ~40%. For line infantry it’s a top stat with Organization and Combat Width.
Quick ways to raise it:
- More infantry battalions and an Engineer Company
- Dig in: Entrenchment buffs Defense
- Don’t confuse it with Breakthrough — Defense barely helps while you’re the attacker
More in the article on Defense.
Breakthrough
What it is. “Defense while attacking”: how much return fire you cover while pushing.
Why it matters. Soft Attack without Breakthrough burns the attacker’s Organization fast. Tanks and assault templates need it; pure defensive infantry can live without stacking it.
Quick ways to raise it:
- Armor battalions and assault support
- Engineer Company gives a solid Breakthrough bump
- Don’t stack only Soft Attack to make the designer look pretty
More in the article on Breakthrough.
Armor
What it is. How hard the division is for enemy Piercing to crack.
Why it matters. If they can’t pierce you, you live longer in the fight. If they can, the Armor bonus mostly evaporates. Regular infantry usually doesn’t need it.
Quick ways to raise it:
- More Armor battalions and thicker plates in the tank designer
- Don’t dilute Armor with spare soft infantry for no reason
- Read Armor with hardness, not in isolation
More in the article on Armor.
Piercing
What it is. How well you punch through enemy Armor.
Why it matters. Without enough Piercing, Hard Attack and big damage numbers underperform into armored targets. Against naked infantry it’s almost irrelevant.
Quick ways to raise it:
- AT, TDs, tank guns built for Piercing
- Newer anti-tank gear by year
- Keep the 100% / 75% / 50% Piercing-to-Armor breakpoints in mind
More in the article on Piercing.
Entrenchment
What it is. How dug-in the division is on its tile. Not the same thing as fort buildings.
Why it matters. Each level is +2% to Defense. Base cap is 5, gain is about +1 per day while standing out of combat. Moving or attacking clears the dig-in.
Quick ways to raise it:
- Engineer Company (+2 to the cap, plus infantry help)
- Leave the division alone on the line for a bit
- Defensive commanders and advisors that help entrenching
More in the article on Entrenchment.
Survivability
Two different pools, and how a template recovers after a scrap. Mixing up Organization and HP is the classic HoI4 beginner mistake.
Organization
What it is. Combat staying power. At zero the division retreats even if HP remains.
Why it matters. Decides who leaves the tile first. High damage with no Organization means a short, flashy fight and a walk-off. In my games, low Organization kills “pretty” templates more often than anything else.
Quick ways to raise it:
- More infantry; spare support gear often dilutes the average
- Doctrines and advisors that push Organization
- Ballpark: infantry often 45–50+, pure tanks sit lower
More in the article on Organization.
HP
What it is. Manpower and equipment pool. How much the division can lose before it’s a hollow shell.
Why it matters. HP is about stockpile losses; Organization is about who holds the fight. Low HP means the template chews through rifles and tanks fast.
Quick ways to raise it:
- More infantry battalions — they carry a lot of HP
- Don’t build a division out of artillery and empty slots
- Field Hospital cuts permanent manpower losses, but that’s a neighboring tool
More in the article on HP.
Recovery Rate
What it is. How fast the division rebuilds Organization out of combat.
Why it matters. After a hard fight it decides how soon the template can attack or hold again. Big deal on short pauses and rotations.
Quick ways to raise it:
- Doctrines and spirits that push recovery
- Don’t leave divisions stuck on red supply forever
- Rotate: pull off the line → rest → send back
More in the article on Recovery Rate.
Manpower
What it is. How many people a full-strength template eats.
Why it matters. Not a combat stat by itself, but it can end a war: fat template × a hundred divisions = empty mobilization. Small countries feel this hard.
How to handle it:
- Don’t inflate Combat Width for no reason
- Separate cheap garrison templates
- Read manpower with losses and reinforcement speed
Speed & Supply
Numbers that decide whether the division reaches the fight — or arrives already starving. Easy to underrate in the designer.
Max Speed
What it is. Division speed = speed of the slowest battalion in the template.
Why it matters. Encirclements, chases, plugging holes. Infantry with towed artillery sits around 4 km/h; motorized is a lot faster. In combat, movement is much slower than on the march.
Quick ways to raise it:
- Pull towed artillery out of fast divisions
- Motorize whatever needs to keep up with tanks
- Don’t mix 4 km/h and 12 km/h in one “breakthrough” template
More in the article on Speed.
Combat Width
What it is. How much “space” the division takes in a fight. Support companies don’t add width — combat battalions do.
Why it matters. Don’t fit — you sit in reserve. Overfill the province cap — efficiency penalty (up to about −33%). Attacking from multiple directions opens more width.
Quick ways to tune it:
- Build the template around typical terrain caps
- Don’t jam three fat divisions into a two-division fight
- Pull reserves in with Initiative and sensible width, not chaos
More in the article on Combat Width.
Supply Use
What it is. How much daily draw the division puts on the supply hub.
Why it matters. Empty crates hit speed, Organization, and the fight itself. Artillery and tanks eat multiples of what infantry does. On-hand buffer is about three days; after that penalties climb.
Quick ways to cut it:
- Logistics Company
- A logistics-minded general — for tanks often worth more than a prettier attack line
- Don’t add another artillery battalion if the hub is already screaming
More in the article on Supply Use.
Fuel Usage
What it is. How much fuel the division burns. For land units it rises on the move, in combat, and while training.
Why it matters. Separate from supply crates. You can be fully supplied and still stall with empty tanks — gear tanks hard on stats and speed.
Quick ways to cut it:
- Logistics Company trims fuel a bit too
- Don’t run spare motorized and tanks with no oil
- Watch Fuel Capacity on long drives
Fuel Capacity
What it is. The division’s internal tank: how long it runs on what it’s carrying.
Why it matters. Deep pushes and bad hubs. Static infantry barely cares.
Quick ways to raise it:
- Tank designer and variants with bigger tanks
- Don’t confuse it with Fuel Usage: a big tank still empties if you’re burning hard
Weight
What it is. How heavy the division is for sealift and invasions.
Why it matters. Heavy templates need more convoys. On a European land front it barely shows; for landings it does.
How to work with it:
- Count convoys before naval invasions
- Don’t shove super-heavy divisions across an ocean without a fleet
Tactics: Recon & Initiative
Not raw damage — how the fight gets “played,” and how fast reserves join the scrap.
Recon
What it is. A template stat for better tactics and combat intel. Not the same as scout planes on the map.
Why it matters. The side with better Recon and commander skill more often wins the tactics contest. Roughly 1 point of Recon edge plays like 5 levels of commander skill for tactics. Each point of Recon also gives about +7.5% land intel from that fight.
Quick ways to raise it:
- Recon company matched to the division’s job
- You can’t stack two different Recon companies on one template
- Infantry often takes cavalry recon; tanks usually want armored recon
More in the article on Reconnaissance.
Initiative
What it is. The signals stat: faster reinforce from reserve, faster planning, stronger fire coordination. Don’t mix it up with the “Initiative!” tactics popup — that one’s from Recon and the commander.
Why it matters. Base chance to enter from reserve is only about 2% per hour. Initiative raises it. It also speeds planning and coordination: gathered fire share = 35% + coordination × (1 + Initiative).
Quick ways to raise it:
- Signal Company (+10% right away, more with levels)
- Armored Signal Company for tanks if you have it
- Research radio in electronics — otherwise national coordination stays weak
More in the article on Initiative.
Reliability & Losses
Stats that decide how much gear and manpower you burn between fights — especially on tanks.
Average Reliability
What it is. Average Reliability of equipment types in the division before the maintenance bonus.
Why it matters. A snapshot of the fleet. Attrition is per type: 80% average doesn’t save tanks sitting at 50%.
Quick ways to raise it:
- Equipment variants built for Reliability
- Don’t stare at the average — watch the weak link
More in the article on Reliability.
Reliability Bonus
What it is. Maintenance company bonus applied to the division’s gear. Stacks with type Reliability; useful effect caps at 100%.
Why it matters. Less loss from attrition, weather, and bad supply; better chance to recover kit after combat. Base Maintenance Company is +5%, up to about +20% with levels.
Quick ways to raise it:
- Maintenance Company on tanks and expensive gear
- Maintenance company levels
- Average can dip from support equipment — the bonus still applies on its own
Equipment Capture Ratio
What it is. Share of enemy gear you can salvage after breaking them.
Why it matters. On long fronts and poor countries, loot actually feeds the army. Pure static defense without counterattacks barely cares.
Quick ways to raise it:
- Maintenance Company — also helps capture
- Finish encirclements instead of only shoving them back
Trickleback
What it is. Full name: trickleback and war support protection. Share of wounded that return to the Manpower pool and hit war support less hard.
Why it matters. Long meat grinders: you burn less mobilization to losses.
Quick ways to raise it:
- Field Hospital in support
- Worth it on mass infantry, not on every tank division
Experience Loss
What it is. How hard the division bleeds earned experience when it replaces losses.
Why it matters. Veteran divisions get dumb if you keep topping them up with green manpower. Less experience loss means you keep quality longer.
Quick ways to cut it:
- Field Hospital
- Don’t take absurd frontal losses for no reason
Training Time
What it is. How long the template takes to train before you can deploy it.
Why it matters. At war start it decides whether you get divisions out in time. Mid-war it’s usually secondary.
How to work with it:
- Simple templates train faster
- Don’t overcomplicate training divisions unless you need to
Rear & misc
Stats that barely decide a head-on fight, but can wreck occupation and sealift math.
Suppression
What it is. How well garrisons crush resistance on occupied land. Not combat damage.
Why it matters. Higher template Suppression means fewer divisions stuck in the rear. About 0.75 Suppression per 1% resistance; the calc isn’t softer than the 10% floor or harsher than the 50% ceiling.
Quick ways to raise it:
- Cavalry + Military Police
- Don’t park tanks on garrison duty for a pretty number
- Frontline templates usually don’t need Suppression
More in the article on Suppression.
How to use this section next: pick a division role → open the matching tabs → hit the minimum on the main combat stats → then read the standalone articles if you need a full write-up on one value.
Quick “where to click” map
| Role | Open first |
|---|---|
| Line infantry | Combat → Defense → Survivability → Supply |
| Tank spearhead | Combat → Attack → Breakthrough → Speed & Supply |
| Under enemy air | Attack (Air Attack) → Combat |
| Garrisons | Rear (Suppression) |