Marmon-Herrington CTMS-ITB1

United States of America/Kingdom of the Netherlands (1941)
Light Tank – 194 Built

After years of neglect, the Royal Netherlands East Indies Army (Koninklijk Nederlandsch-Indisch Leger, abbreviated to ‘KNIL’) tried to re-equip itself with new material starting in 1936. Four Vickers tanks, two light and two amphibious, were acquired and the KNIL was satisfied with the results of testing them, so 73 light tanks were ordered. Furthermore, 45 gun-armed Vickers command tanks were ordered in 1939 but, due to the outbreak of the war, Britain needed all its resources and production facilities to reinforce its own army and no more than twenty light tanks and no command tanks arrived in the Indies.
In desperate need of armor, the KNIL turned to the company Marmon-Herrington, the only non-European commercial tank building company at the beginning of World War 2. In total, 628 tanks were ordered: 234 CTLS-4TA, 194 CTMS-ITB1, and 200 MTLS-1G14 tanks. These tanks were all based on the same principle design, but features were added on Dutch request. The complete order of 194 CTMS was completed, but only 31 ended up with Dutch troops in its Caribbean colonies, among which were Suriname, Aruba, Curaçao and a few smaller islands, also referred to as the ‘West Indies’. Thirty others were sent to Cuba, Ecuador, Guatemala, and Mexico respectively as part of the Lend-Lease program and were commonly known under the nickname ‘Dutch three men tank’.

The Design

The CTMS (Combat Tank Medium Series) was essentially just a bigger CTLS tank. The tracks were redesigned and wider, measuring 15 inches (38 cm). Some spare tracks were put at the front of the lower hull. Two small lights were placed on the front. The tank was propelled by a Hercules RLXDI inline-six petrol/gasoline engine. It produced 174 hp at 2600 rpm which resulted in a maximum speed of 25 mph (40 kph). The exhaust was located on the left side and covered by a grid. Three vents were located on the engine deck. The suspension was composed of vertical volute springs and four small wheels. Two return rollers guided the tracks and the sprocket was located at the front. The sliding gear transmission was manually operated with five-speed forwards and one in reverse.
The main armament was a 37mm 44 caliber automatic gun. The gun was designed by the American Armament Corporation. The standard US 37mm M5 or M6 gun did not fit in the turret. Coaxially, a .30 Cal (7.62mm) Colt machine gun was mounted. Up to three Colt machine guns could be fitted in the hull, but it appears that a maximum of two was used in any case. The gunner was provided with a telescope through which he could aim both the gun and the coaxial machine-gun. No radio was installed, although it is possible that some were mounted during local adjustments.
The vehicle weighed 13 US tons (11.340 kg), which resulted in a ground pressure of 9 psi (0,633 kg/cm2). The tank could take slopes of 50 percent. The armor consisted of bolted plates. Three vision slits were located in the front hull and one on each side. Some vision slits were located in the turret as well and were all protected by glass blocks.

In Dutch Service

As already mentioned, the KNIL ordered a total of 628 tanks. The Marmon-Herrington company, having no experience handling an order this big, suffered from huge production delays and the first planned delivery date of 165 CTLS and 140 CTMS tanks on January 1st 1942 could not be met. In fact, 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. In the meantime, the contract was still being completed, but at this stage taken over by the US government.

Now that the Indies had fallen, the only remaining free part of the Kingdom of the Netherlands was the Antilles and Dutch Guiana (Suriname). In May 1942, the Bataljon Vechtwagens (Tanks Battalion) was formed of which some personnel was already trained in the USA. The battalion was part of the Mixed Motorized Brigade and its personnel consisted of a marines detachment, about eighty men, and a detachment from the Princess Irene Brigade, of 225 men.
Within a short time, among other equipment, 73-74 tanks were sent to Suriname, 28 CTLS, 26 CTMS and 19-20 MTLS tanks. However, the Dutch Army could not directly provide enough resources to maintain a full battalion, as it 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 Princess Irene Brigade also returned to England in 1943, in preparation for the planned invasion of France. To make matters worse, volunteers left for Australia to join the Dutch troops stationed there. This huge lack of personnel meant that the battalion could only operate a small part of their tanks.

When even more men were allowed to go home after the war in 1946, the tank unit had to be disbanded and all tanks were put in storage, some even left out in the open. Some sources suggest that a few tanks were sent to the Indies in 1946 to fight in the Independence war, but this has never been strongly confirmed and is quite unlikely. What happened to the single CTMS sent to Aruba and the two sent to Curacao is unknown.
In 1947, it was decided that an active cavalry unit was desired to be deployed in Suriname but many tanks were in a bad state. Turrets were rusted to the hull and many lacked armament. In 1954, not more than 10 out of the original 74 tanks were still operational. One of these lacked a turret and was used as a recovery vehicle, although it is sometimes identified as a command tank as well. In 1956, only two were still in running order and a year later, in 1957, the tank unit was discontinued. All vehicles were scrapped.

Ecuador’s First Tank

The Ecuadorian Army also got their hands on the CTMS when they tried to buy weapons after the war with Peru in 1941. Twelve vehicles were purchased from the United States and landed in the city of Guayaquil between February and March 1942 or 1943. By rail, they were transferred to the city of Quito and transferred to the newly formed Tank School Squadron no.1 (Escuadrón Escuela de Tanques no. 1). This squadron was based in the camp of the ‘Yaguachi’ Cavalry Group (Grupo de Caballería), located in the city district of La Magdalena.
The Peruvian invasion of Ecuador in 1941 and the US involvement in the Second World War hindered US Army officials from instructing or advising the Ecuadorian Army and instructors would not arrive until 1946. However, justified by the need of training in American tanks, Ecuadorian personnel was sent to the US to become tank instructors for the Ecuadorian Army. Among them were Lieutenants Reinaldo Varea Donoso, Andres Arrata Macias, and Carlos Arregui Armas.
Unlike other armies, the Ecuadorian Army was quite pleased with the performance of the tanks and were kept in service until 1959. Five vehicles were preserved and put as monuments. One is located at the National Military Academy in Quito. In southern Quito, two pairs of CTMS tanks are located at the Epiclachima Mechanized and Motorized Equipment School. Each tank bears a different nickname, the first pair was named after Indian chiefs: Atahualpa and Epiclachima. The other two are named after war heroes from the Ecuadorian-Peruvian war: Captains Juan I Pareja and Hugo Coronel. All five vehicles appear to have either new or fake guns, as the barrels seem too long.

Accompany for the CTVL

Mexico acquired four tanks in 1942 via the Lend-Lease program. They accompanied the nine Marmon-Herrington CTVL tanks already in service in 1938 in the Compañía Reducida de Tanques Ligeros (Reduced Light Tanks Company), based in Mexico City. Later, they were added to the tank group of the Brigada Motomecanizada (Mechanized Brigade). In 1955, they were taken out of service and put in storage after which all four were scrapped.