WW2 Dutch Tanks WW2 US Medium Tanks

Marmon-Herrington MTLS-1GI4

United States of America/Kingdom of the Netherlands (1941-1957)
Medium Tank – 125 Built

The Marmon-Herrington MTLS-1GI4 is probably the most unusual tank produced by the Marmon-Herrington company before and during the Second World War. During the spring of 1941, 200 pieces were ordered by the Netherlands Purchase Commision for the Royal Netherlands East Indies Army (Dutch: Koninklijk Nederlandsch-Indisch Leger, abbreviated to ‘KNIL’), in a desperate move to equip itself with tanks. Armed with twin 37mm guns and up to 7 machine guns, the tank was a one of a kind.

The MTLS at Aberdeen. The unusual machine-gun mount in the side of the turret stands out. Photo: Nicholas ‘The Chieftain’ Moran

Dutch order

Starting in 1936, the KNIL tried to re-equip itself, as it had been neglected for nearly twenty years. Four Vickers tanks, including two amphibious models, were obtained and, satisfied with the results of testing, the KNIL placed an order for 73 light tanks and 45 gun-armed command tanks, but due to the outbreak of the war, only 20 light tanks were delivered before the UK blocked all exports. So, the KNIL turned to the United States and bought a total of 628 Marmon-Herrington tanks instead. Two hundred of these were the MTLS-1GI4 model. It was agreed that the complete order of CTMS and CTLS and 100 MTLS tanks should be delivered before 1st July 1942. Due to the company having no experience handling an order this big, they suffered from huge production delays and only a small number of the CTLS made it to the East Indies before Java was occupied by the Japanese and all transports were canceled. The production order was taken over by the US Army and production of the 200 MTLS was halted by the US after just 125 pieces had been built.

Both pictures taken at Aberdeen Proving Grounds. Photo: Nicholas ‘The Chieftain’ Moran


The MTLS tank was an enlarged version of the CTMS tank which, in turn, was based on the Combat Tank Light series (CTL), designed by Marmon-Herrington in the mid-1930’s. Although the vertical volute spring suspension was reinforced compared to the CTL tanks, it was not really fit to support a weight of 22 US tons (20,000kg). The armor thickness varied between 1½ inches (38mm) at the front and ½ inch (13mm) on top. The tracks were 18 inches (46cm) wide. The Hercules gasoline engine produced 240 horsepower and resulted in a maximum speed of 25 miles per hour (40 kph).

The twin mounted semi-automatic 37mm L.44 guns were designed by the American Armament Corporation. Both could be loaded with a clip of five shells. Although a high firing rate was promised, tests at Aberdeen concluded they often could not even fire a single shell. A .30 cal machine-gun was mounted coaxially. Another one was ball-mounted in the right front sidewall of the turret and faced forwards. Two machine-guns could be mounted on the back of the turret and serve as anti-air guns. Two more machine-guns could be mounted fixed in the hull, although most of the times only one was installed, while a seventh was located in a ball-mount.

A Dutch MTLS is overtaking a ditch. Note that six machine guns are fitted. Source: NIMH
An MTLS, in used by Dutch Forces in Suriname during the 1950s. Note the presence of Dutch flags painted on top of the guns housing and on the side of the hull. Source: NIMH

The MTLS had some severe design flaws, as the vehicle was essentially an enlarged version of a vehicle weighing less than 10 US tons, now coming in at 22 US tons. The increased weight had a severe impact on the suspension and overall structure of the vehicle, making it very unreliable. Furthermore, the increase of the number of crewmen from two to four was not well taken into account and, as a result, the complete crew had to enter through the hatch on top of the turret, which would be rather inconvenient in a combat situation.

Fit for US service?

One MTLS was tested at the Aberdeen Proving Grounds by the US starting in April 1943 and continuing until November. The test results were clearly stated in the report: “The vehicle is thoroughly unreliable, mechanically and structurally unsound, underpowered and equipped with unsatisfactory armament. The 4-Man Dutch Tank Model MTLS-1GI4 is not a satisfactory combat vehicle for any branch of the Armed Forces”. However, in 1946, the vehicle was still present at Aberdeen, together with the CTMS tank, which was also tested, but what happened to them afterward is unknown.

An MTLS, next to an M22 Locust airborne tank, also produced by Marmon-Herrington. Photo:

Sent to Suriname

Although the Netherlands was occupied by the Germans and the Dutch Indies were occupied by the Japanese, the Kingdom of the Netherlands still possessed colonies in Latin America. These were very important for the US as they provided oil and most of the bauxite that was needed for the production of aluminum. For defense, first American troops, but later troops from Puerto Rico were stationed at these Dutch colonies. Furthermore, a Tank Battalion (Bataljon Vechtwagens) was founded in May 1942, based in Suriname.

Together with 28 CTLS and 26 CTMS tanks, 19 MTLS tanks were sent to Suriname. They were operated by the battalion which consisted out of a marines detachment, about eighty men and a detachment from the Prinses Irene Brigade, with 225 men and soldiers that were already stationed in Suriname. However, the Dutch Army could not directly provide enough resources to maintain a full battalion, which lacked personnel and accommodation, but a ‘half-battalion’ was formed during the summer of 1943. Unfortunately, the marines detachment moved to the USA in September 1943 for training and the group from the Prinses Irene Brigade also returned to England in 1943, in preparation for the planned invasion in France. To make matters worse, volunteers left to Australia to join the Dutch troops stationed there. This huge lack of personnel led to that the battalion only operated a small portion of their tanks. Plans to ship all MTLS  tanks to Indonesia after the Second World War were quickly abandoned, because it was considered to be too expensive.

Camouflaged MTLS during exercises in Suriname, 1950’s. Photo: Dutch military archives
Anothter picture of an MTLS in action in the 1950s, possibly around the same time as the image above. Note that apparantly, one gun barrel has been removed.: Source: NIMH
Two MTLS and three CTMS during a training session. the MTLS in front is called Draak, meaning Dragon in English. Source: NIMH

Eventually, the tank unit was disbanded in 1946 and all tanks were put into storage. When it was decided that the tank unit should be operational again in 1947, most of the tanks were in a bad state. Rusting and lacking equipment, only a part of the 73 original tanks could be made operational. How many MTLS tanks were operational at this point is not specified. Seven years later, in 1954, only ten tanks were still operational, among them at least two MTLS. In 1956, this number was reduced to two, until the tank unit was discontinued in 1957. The tanks were not immediately scrapped as there is some documentation of wrecked tanks after 1957.

Picture from 1967, showing a rusted and stripped MTLS hull. Location is unknown, somewhere in Suriname.
A rather blurry picture of two non-operational MTLS tanks in 1964. De “Stooters” means something like ‘the Breachers’, but it is unclear whether this was a nickname for the MTLS or just a general nickname to refer to any tank. Source: Magazine ‘De Fotoclub’, 28 October, 1964

Illustration of the Marmon-Herrington MTLS-1GI4 light tank. The vehicle is missing its hull machine-gun. Illustrated by Jaroslaw “Jarja” Janas and sponsored by Deadly Dilemma through our Patreon page


Dimensions (L-W-H) 4.9 x 2.64 x 2.81 m
Total weight, battle ready 20.000kg (22 US tons)
Crew 4
Propulsion Hercules water-cooled engine, 240hp
Speed 40 km/h (25mph)
Armament Dual 37mm L.44 AAC guns
Up to seven .30 cal (7.62mm) Colt or Browning machine guns
Armor 13-38mm (½”-1½” inch)


Nicholas ‘The Chieftain’ Moran
Jane’s World War II Tanks and Fighting Vehicles, The Complete Guide, Leland Ness.
World War 2 In Review: American Fighting Vehicles, Issue 2, Merriam Press.
De Surinamer: Nieuws en advertentieblad, 1 February 1949.
Presidio Press, Stuart: A History of the American Light Tank, R.P. Hunnicutt.
On, Hanno L. Spoelstra.

11 replies on “Marmon-Herrington MTLS-1GI4”

I’ve been waiting for this article!
Thanks for writing this.
Interesting tank, and I really like the two barrels.

Do I understand correctly that the dual 37mm would fire all 10 shells in about 1 second on full auto?
Is this weapon adapted from an AA gun?
What other fire modes did it feature?

I have sent your question to the author.
The guns could also fire single shot. He is looking for more info to give a more complete answer.

Hello Falk,
The gun was developed by the American Armament Coorporation and is known to have developed some automatic guns, also designed to be fitted in aircraft. Although it is a myth that they designed the 37 mm P-39 aircraft cannon, they definetly developed some automatic cannons.
Unfortunately, there is nearly no information on the subject of these guns, but I can recommend this forum threat: which is about AAC 37 mm guns, also in use with the Dutch forces.
Kind regards,

Anyone know where I could find some sort of blueprint for this tank? I’d love to try and scratch build this.

So I am curious about how much ammunition it could carry for its main guns the Twin 37s. It’s not much smaller than an Ostwind which carried 1,000 rounds for its single 37, mind you the Osteind was an SPAA conversion of a panzer 4. Are there known figures of how many rounds the MTLS could carry for its armaments?

Unfortunately, I don’t know. Information on this tank, especially regarding the armament, is somewhat limited. The testing reports from Aberdeen may include information on this, but I don’t have these.
Kind regards, Leander

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