The Renault R40 or Char léger modèle 1935 R modifié 1939 was a French light infantry tank that was used early in World War II, an improvement of the Renault R35, of which it is often considered a variant. Two new tank battalions, originally intended and trained to be equipped with Hotchkiss tanks to form the half-brigade of the new 4e DCR ( fourth armoured division of the Infantry), the 40e Bataillion de Chars de Combat and the 48e BCC, were during the campaign of 1940 from 19 May as an emergency measure partly equipped with the R 40 (30 and 29 respectively) and attached to the 2e DCR. This reflects the large matériel reserve of Renault tanks. Some R 40s perhaps replaced losses in the older battalions. One of the two tank battalions of the Polish 10th Armoured Cavalry Brigade being formed in France was also partly equipped with first 24 R 40s, which were then on 31 May given to 25 BCC, after which the Polish battalion received another 28 R 40s, the last thirteen on 19 June.
