They had been posted in the Ardennes sector and found themselves badly prepared to stop the German advance, only participating in skirmishes, covering actions and support actions for the infantry, but proved easy prey for the Panzer II and many armored cars equipped with the same 20 mm gun.
The losses were appalling. An AMR 33 of the 3rd DLC was the first French tank destroyed in battle, but most of the 75% losses occurred due to breakdowns issues rather than enemy fire. On June 7, 1940, the 7e DLM was created of surviving vehicles and some reserves, having 14 AMRs in total. Most were lost. After the armistice, the Germans captured a handful of these models, renamed Panzerspähwagen VM 701 (f). They never left French soil and were probably kept for patrolling and anti-partisan activity. A single AMR 33 has survived to this day. It is on static display at the Saumur tank museum in France.