The Devon and Cornwall County Division was a County Division of the British Army created during the Second World War. It was formed on 28 February 1941, from recently recruited soldiers, in response to the renewed threat of a German invasion. The 10,000-strong division was a static formation, lacking transport, intended to defend possible landing sites along the southern Cornish and Devon coastlines from invading German troops. The creation of the division also helped to free up the more experienced troops, who were then held back from the coastline to be able to launch a counterattack against any potential German landings.

The 77th Infantry Division of the British Army was formed in 1941, during the Second World War, from the re-organisation of the Devon and Cornwall County Division. During its existence the division changed roles several times. The division's initial role was coastal defence, protecting Devon. On 20 December 1942, it was converted into a training formation, known as a reserve division. In this capacity, the division provided final tactical and field training for the infantry that had already passed their initial training. After five additional weeks of training, the soldiers would be posted to fighting formations overseas. The division also had a tank brigade attached to provide training in armoured warfare.