Thomas C. Theiner Profile picture
May 25, 2022 โ€ข 26 tweets โ€ข 10 min read โ€ข Read on X
With the M777 and CAESAR two of the four artillery systems promised to Ukraine are now confirmed to be at the front in Donbas:

๐Ÿ‡บ๐Ÿ‡ธ๐Ÿ‡ฆ๐Ÿ‡บ๐Ÿ‡จ๐Ÿ‡ฆ M777
๐Ÿ‡ฎ๐Ÿ‡น FH70
๐Ÿ‡ซ๐Ÿ‡ท CAESAR
๐Ÿ‡ณ๐Ÿ‡ฑ๐Ÿ‡ฉ๐Ÿ‡ช PzH 2000

How do they work? What are their differences? What makes the later two the best?
A thread ๐Ÿงต:

1/n
All 155 mm NATO howitzers operate the same way and if you have not yet read my earlier thread about operating an American M777 howitzer, please do so now to familiarize yourself with fuzes, projectiles, primers, charges, etc. and how they are used.



2/n
M777 and FH70 are towed 155 mm howitzers with 39 caliber barrels.
This means their barrels are 39 ร— 155 mm = 6045 mm
This results in an 18 liter charge chamber, which can fit up to 5x M232A1 charges. Therefore the range for both guns is the same.

3/n
The FH70 includes a small engine, which allows the gun crew to drive it into position. The engine also powers the hydraulics to emplace the gun.

This makes the FH70 easier and faster to set up than a M777, which is emplaced by pure muscle power and needs a truck to move.

4/n
The FH70 and M777 use the same projectiles, fuzes, and charges. Only the primers are of different size. The sequence of preparing the projectiles and then loading the gun is also the same.

5/n
Just like the M777, the FH70 has to be sighted optically and adjusted manually. After each shot the gunner has to check and correct the gun.

The M777 A1/A2 are fully digitized and sighted with two LCD displays, but all M777 are adjusted manually too.

6/n
One advantage of the FH70 is the semi-automatic projectile loading. The projectile still needs to be rammed into the barrel, but this still results in a higher rate of fire than the M777.

Other advantages are the automatic loading of the primer when the breech closes and
7/n
the ability to fire the gun from the gunners seat, while the M777 requires the use of a lanyard.

The M777 and FH70 are similar systems and Ukrainian troops will use them in similar ways, which cannot be said about the next two systems.
8/n
CAESAR and PzH 2000 are self-propelled 155 mm howitzers with 52 caliber barrels: 52 ร— 155 mm = 8060 mm
The longer barrel allows for a larger charge chamber of 23 liter. This larger chamber can fit up to 6x M232A1 charges, which results in a better range for both systems.

9/n
This one charge more improves the range of both systems for base bleed projectiles from 29 km to 40 km and for standard projectiles from 24 km to 30 km.

But the extended range is not the main advantage of these two systems.

10/n
The CAESAR is fully digitized, with automatic gun laying, semi-automatic projectile loading, automatic ramming, and automatic primer loading. This allows the CAESAR to stop, emplace, fire 6x rounds, and depart in less than 2.5 minutes as this old French Army video shows.

11/n
This speed allows the CAESAR to operate within range of russian artillery. M777 and FH70 crews will likely avoid operating within 20 km of the frontline as there they would be in range of russian counter battery fire.

But counter battery fire is no problem for the CAESAR
12/n
or PzH 2000. Both will be long gone before russian return fire hits:

1) russian radar picks up CAESAR fire
2) russian radar informs a battery to fire back
3) russian battery sights and loads its guns
4) russian battery fires
5) russian projectiles need 70-80 seconds to hit

13/n
but already by the time a russian battery gets the order to fire back the CAESAR and PzH 2000 are gone. This is the main advantage of modern self-propelled artillery: the ability to shoot and scoot.

14/n
The only drawback of the CAESAR is that it carries only 18x rounds. So after 3x stops to fire 6x rounds the CAESAR has to return to the ammunition supply point to reload.

Still the CAESAR is the best artillery systems in Ukraine now... until the PzH 2000 arrives.

15/n
The PzH 2000 is fully digitized, with automatic gun laying, automatic projectile loading, automatic ramming, automatic fuze setting, and automatic primer loading.

The PzH 2000 is also Multiple Round Simultaneous Impact (MRSI) capable - it's the best system in the world.

16/n
The PzH 2000's automatic magazine holds 60 projectiles, sorted to allow the use of different projectiles and fuzes in a fire mission.

Btw: the guy in the back of this photo is the driver.
17/n
The magazine is loaded by hand. It takes about 12 minutes to load all 60 projectiles and 288 charges.

18/n
To speed up reloading the projectiles and fuzes are prepared by a dedicated support crew at the ammunition supply point (the same is done for the CAESAR).

19/n
When the PzH 2000 commander receives a fire mission he orders the driver to park at a suitable location. Once stopped turret and gun barrel automatically deflect and elevate for the fire mission.
If time or proximity fuzes need to be set, the gun does this automatically too.
20/n
Due to all the automation 3x rounds can be fired in 10 seconds. Or 20x rounds in 2 minutes.
After each round the fire computer automatically re-adjusts the barrel and improves accuracy by using data gathered by the radar on the barrel, which measures the projectile's speed.

21/n
The PzH 2000 also has MRSI capability, which means it can calculate and automatically adjust the barrel to deliver up to 5x projectiles at the same moment onto the same target.

No russian system has this capability.

22/n
Sadly Ukraine only will get 12x CAESAR and 12x PzH 2000. Ukraine needs more such systems.

Ukraine is now in talks to acquire Slovak Zuzana 2 howitzers, which are similar in capability to the PzH 2000... but it might take months for them to be built and arrive.

23/n
If we want Ukraine to win this war, we must send more Western artillery: especially self-propelled artillery with 52 caliber barrels and automatic gun laying (CAESAR, PzH 2000, Zuzana 2, AHS Krab (photo), AHS Kryl, K9 Thunder, Archer).

24/n
But we also must send M270 MLRS or M142 HIMARS (photo), because without them russian supply points and long range air defense positions remain out of reach for Ukrainian artillery.

The brave Ukrainians need our help. Let us be brave like them and send them all they need.

25/n.
What military/ weapons/ tactical/ strategic/ logistics/ materiel/ historic topic should I thread about next?

Please leave suggestions and wishes under this tweet.

โ€ข โ€ข โ€ข

Missing some Tweet in this thread? You can try to force a refresh
ใ€€

Keep Current with Thomas C. Theiner

Thomas C. Theiner Profile picture

Stay in touch and get notified when new unrolls are available from this author!

Read all threads

This Thread may be Removed Anytime!

PDF

Twitter may remove this content at anytime! Save it as PDF for later use!

Try unrolling a thread yourself!

how to unroll video
  1. Follow @ThreadReaderApp to mention us!

  2. From a Twitter thread mention us with a keyword "unroll"
@threadreaderapp unroll

Practice here first or read more on our help page!

More from @noclador

Sep 13
Of course russia can quickly seize the Suwaล‚ki Gap and cut of the Baltics from the rest of NATO... but have you had a look at Kaliningrad's border and the flat dry country beyond?

There are 9 Polish brigades in that area (and 11 in reserve, with 4 more forming). Sure russia
1/5 Image
could move 50,000+ men to Kaliningrad to secure the border or build a defence line along the Pregoล‚a river... but those need to be supplied from Belarus, which also is easily invaded unless russia sends 50,000+ troops to secure its flank there. A buildup of 200,000+ russian
2/5
troops in Belarus would be noticed by NATO (and ordinary people in Belarus, who would upload 100s of videos of the arriving russians).
In summary the main risk isn't that russia suddenly seizes and fortifies the Suwaล‚ki Gap... the main risk is that russia starts building up
3/5
Read 5 tweets
Sep 7
The North Atlantic - one of the key battles in a russia-Europe war.

If Europe is defeated here, which with Europe's current forces and capabilities, is almost certain to happen... then russia can nuke the UK without fear of retaliation.

This will be a unsettling thread:
1/40 Image
This battle will be very different from the battles in the Black Sea and Baltic Sea, which I discussed in an early thread, which is linked below.

To understand the North Atlantic Battle we need to look at Imperial Germany's WWI submarine campaign,


2/n
and at the WWII Battle of the Atlantic. We will also have to take a deep dive into the Cold War and that era's submarines and submarine tactics.

In WWI the Imperial German Navy sent some 300+ submarines into the Atlantic, which sank more than 4,000 merchant vessels. The UK
3/n Image
Read 41 tweets
Sep 4
2 days ago I did a thread about the reasons russia can't defeat Ukraine and yet is still a deadly threat to Europe and NATO (link to the thread the next tweet).

Today I will talk about three of the fronts of a russia-Europe war:
1) Black Sea
2) Baltic Sea
3) North Atlantic

1/36 Image
These three fronts will be air and sea battles, while Finland and the Baltics will be air and land battles; about which I will talk in another thread in the coming days.

I do not believe the US under control of Trump or Vance would come to the aid
2/n
of Europe... we will be on our own, which will have very dire consequences for the battle in the North Atlantic and thus the UK.

First, let's look at the Black Sea, where russia's Black Sea Fleet has already been savaged by the Ukrainians (pic: the sinking cruiser Moskva).
3/n Image
Read 36 tweets
Sep 1
โ€ข russia has no chance to defeat Ukraine
โ€ข russia is a deadly threat to NATO and the EU

Both of these are true... because as of 2025 Ukraine fields a far more capable military than NATO's 30 European members combined (!).

Let me explain.
1/39 Image
As of August 2025 russia fields more than 1,3 million troops; at least half of which are fighting in or against Ukraine.

Ukraine has an estimated 1 million troops... maybe even 1,1 million troops. NATO's European members have double that: some 2.2 million troops, but
2/n Image
(there is always a "but" with European militaries):

โ€ข with more than double the personnel European NATO members manage to field only 20% more combat brigades than Ukraine. Partly because Western navies and air forces are bigger, but mostly because in all European militaries
3/n Image
Read 39 tweets
Aug 18
People forget that for most if its history Europe was much, much more militarized than even during the Cold War.

Italy, from the end of the Third War of Independence in 1866 to 1939 fielded always 360-400 battalions, which fell to 110-115 during the Cold War, as the US
1/14 Image
backed its European allies with the its massive air force. Today Italy fields 41 battalions (infantry, tanks, recon, special forces, rangers).

Likewise the British Army fielded for most of its history (especially after the 1908 Haldane reforms) 450-480 battalions, which came
2/n Image
in three types: 150-160 regular battalions (of which a third was always in India), around 100 reserve battalions to provide replacements for the regular battalions, and 200-220 territorial battalions, which (at least on paper) could not be deployed overseas. The British Army
3/n
Read 14 tweets
Jul 4
This is Berlin.

And this is how Berlin would look like 3 days after putin attacks Europe... because Germany doesn't have the air defence ammo to defend any of its city for more than 2 days.
1/12 Image
Image
This is Copenhagen.

And this is how Copenhagen would look like the morning after putin attacks Europe... because Denmark doesn't have any air defence to defend itself.
2/12 Image
Image
This is Paris.

And this is how Paris would look like a day after putin attacks Europe... because France only has SAMP/T air defence systems, which is as of now has very limited capabilities against ballistic missiles.
3/12 Image
Image
Read 12 tweets

Did Thread Reader help you today?

Support us! We are indie developers!


This site is made by just two indie developers on a laptop doing marketing, support and development! Read more about the story.

Become a Premium Member ($3/month or $30/year) and get exclusive features!

Become Premium

Don't want to be a Premium member but still want to support us?

Make a small donation by buying us coffee ($5) or help with server cost ($10)

Donate via Paypal

Or Donate anonymously using crypto!

Ethereum

0xfe58350B80634f60Fa6Dc149a72b4DFbc17D341E copy

Bitcoin

3ATGMxNzCUFzxpMCHL5sWSt4DVtS8UqXpi copy

Thank you for your support!

Follow Us!

:(