'Cannae' (i) was a German contingency plan for the relocation of General Heinz Guderian’s Panzergruppe 'Guderian' within Generaloberst Gerd von Rundstedt’s Heeresgruppe 'A' farther to the south-west if required for the completion of 'Rot' (ii) in the final defeat of France (10 June 1940).

In the event, the Panzergruppe 'Guderian' 1 came into the line between a point to the west of Reims and a point to the east of Rethel, the XXXIX Corps (mot.) on the Panzergruppe's right and the XLI Corps (mot.) on the Panzergruppe's left. By 22 June the XXXIX Corps (mot.) had driven to the south-west and south to take Angoulême, Clermont Ferrand, Vichy and St Etienne, while the XLI Corps (mot.) had driven to the south and south-east to take Lyons and Pontarlier.