In 1939, following the German occupation of Czechoslovakia in March 1939, 244 vehicles of the Czechoslovak Army were seized by the Germans where they were known as the L.T.M.35 until January 1940.
In German service, they were used as substitutes for the Panzerkampfwagen III medium tank.
They were assigned to the Panzer Battalion (Panzerabteilung) 65 (39) of the 1st Light (leichte) Division and the independent Panzer-Regiment 11 (81) where they participated in the invasion of Poland.
77 of these were lost during the campaign, mostly due to mechanical breakdowns, but only 7 of these were irreparable.
From 1940 on, there had not been any spare parts available and tanks had to be completely rebuilt to remain operational.

The 1st Light Division absorbed the 11th Panzer Regiment and was redesignated as the 6th Panzer Division on 18 October 1939.
It took 132 Pz.
Kpfw.
35(t)s into the Battle of France where it was assigned to XXXXI Corps (mot.)
for Panzergruppe von Kleist's attack through the Ardennes.
44 of these had been lost by the end of May. 35 replacements were issued on 3 June in preparation for Fall Rot, the attack on the remnants of the French Army that began the following day.
A total of 62 Pz.
Kpfw.
35(t)s were either total write-offs or were damaged beyond the ability of the field maintenance workshops to repair during the campaign.


For the invasion of the Soviet Union, 6th Panzer Division had 160 Pz.
Kpfw.
35(t)s.
to support 4th Panzer Group's drive on Leningrad.
By 10 September 1941, the division had only 102 operational Pz.
Kpfw.
35(t), despite having received two replacements from Germany.
Eight tanks were repairable, but 47 were total losses.
By 31 October, only 34 were operational with another 41 requiring repair.
On 30 November, all Pz.
Kpfw.
35(t)s were reported non-operational.

The average distance driven is 12,500 kilometres (7,800 mi) for the Pz.
Kpfw.
35(t).
The special situation in regard to repair the Pz.
Kpfw.
35(t) is well known.
It is indeed deemed necessary to point out that repairs can only be accomplished by cannibalizing other Panzers because there are no longer any spare parts for the Pz.
Kpfw.
35(t).
This means that after retrieval of the Panzers that are scattered around the terrain, a maximum of 10 can actually be repaired out of the 41 Pz.
Kpfw.
35(t) reported as needing repair.
The Pz.
Kpfw.
35(t) can no longer be rebuilt.
All of the components are worn out.
To be practical, maybe the armored hulls are still useable.

— Commander, 6th Panzer Division, 31 October 1941
Due to the cessation of production of these tanks, and the absence of spare parts being made, it was decided that the summer campaign of 1941 was to be their last.
The fighting in Russia exposed the vehicle's unsuitability for cold weather operations and general unreliability.
This weakness, in addition to their thin armour and inadequate firepower, resulted in the 6th Panzer Division being reequipped with German tanks on its withdrawal from Russia in April 1942.
All 26 remaining Pz.
Kpfw.
35(t)s still in working condition in 1942 were sold to Romania.
Some vehicles had their turrets and hull machine guns removed so that the chassis could serve as a munition carrier or an artillery tractor, the Artillerie Schlepper and the Mörserzugmittel 35(t).
These had a towing capacity of 12 tonnes (12 long tons; 13 short tons).
In 1939, following the German occupation of Czechoslovakia in March 1939, 244 vehicles of the Czechoslovak Army were seized by the Germans where they were known as the L.T.M.35 until January 1940. In German service, they were used as substitutes for the Panzerkampfwagen III medium tank. They were assigned to the Panzer Battalion (Panzerabteilung) 65 (39) of the 1st Light (leichte) Division and the independent Panzer-Regiment 11 (81) where they participated in the invasion of Poland. 77 of these were lost during the campaign, mostly due to mechanical breakdowns, but only 7 of these were irreparable. From 1940 on, there had not been any spare parts available and tanks had to be completely rebuilt to remain operational.
The 1st Light Division absorbed the 11th Panzer Regiment and was redesignated as the 6th Panzer Division on 18 October 1939. It took 132 Pz.Kpfw. 35(t)s into the Battle of France where it was assigned to XXXXI Corps (mot.) for Panzergruppe von Kleist's attack through the Ardennes. 44 of these had been lost by the end of May. 35 replacements were issued on 3 June in preparation for Fall Rot, the attack on the remnants of the French Army that began the following day. A total of 62 Pz.Kpfw. 35(t)s were either total write-offs or were damaged beyond the ability of the field maintenance workshops to repair during the campaign.

For the invasion of the Soviet Union, 6th Panzer Division had 160 Pz.Kpfw. 35(t)s. to support 4th Panzer Group's drive on Leningrad. By 10 September 1941, the division had only 102 operational Pz.Kpfw. 35(t), despite having received two replacements from Germany. Eight tanks were repairable, but 47 were total losses. By 31 October, only 34 were operational with another 41 requiring repair. On 30 November, all Pz.Kpfw. 35(t)s were reported non-operational. 
The average distance driven is 12,500 kilometres (7,800 mi) for the Pz.Kpfw. 35(t). The special situation in regard to repair the Pz.Kpfw. 35(t) is well known. It is indeed deemed necessary to point out that repairs can only be accomplished by cannibalizing other Panzers because there are no longer any spare parts for the Pz.Kpfw. 35(t). This means that after retrieval of the Panzers that are scattered around the terrain, a maximum of 10 can actually be repaired out of the 41 Pz.Kpfw. 35(t) reported as needing repair. The Pz.Kpfw. 35(t) can no longer be rebuilt. All of the components are worn out. To be practical, maybe the armored hulls are still useable.
— Commander, 6th Panzer Division, 31 October 1941
Due to the cessation of production of these tanks, and the absence of spare parts being made, it was decided that the summer campaign of 1941 was to be their last. The fighting in Russia exposed the vehicle's unsuitability for cold weather operations and general unreliability. This weakness, in addition to their thin armour and inadequate firepower, resulted in the 6th Panzer Division being reequipped with German tanks on its withdrawal from Russia in April 1942. All 26 remaining Pz.Kpfw. 35(t)s still in working condition in 1942 were sold to Romania. Some vehicles had their turrets and hull machine guns removed so that the chassis could serve as a munition carrier or an artillery tractor, the Artillerie Schlepper and the Mörserzugmittel 35(t). These had a towing capacity of 12 tonnes (12 long tons; 13 short tons).
Panzer 35(t)