V Force was a reconnaissance and intelligence-gathering organisation established by the British during the Burma Campaign in World War II.
V Force was envisaged as a "stay-behind" force. If the Japanese had invaded India after the monsoon ended late in 1942, V Force was to harass their lines of communications with ambushes and sabotage, and to provide intelligence from behind enemy lines.
The force was organised into six area commands, corresponding to the Indian Civil Service administrative areas, which in turn corresponded to the enthnicity of the inhabitants of the various parts of the frontier. Each area command had a Commander, Second-in-Command, Adjutant, Quartermaster and Medical Officer, four platoons (about 100 men) of the paramilitary Assam Rifles and anything up to 1,000 locally enlisted guerillas or auxiliaries.
The area commanders and other officers were rarely Regular Army officers; the qualification for appointment was more often expert knowledge of the local language and peoples. Some were police officers or former civil administrators. Even some tea planters served as senior officers of V Force.
The Japanese did not invade India in 1942, as had been feared. V Force was able to consolidate itself in the wide area between the Allied and Japanese main forces. Bases and outposts were set up, standing patrols instituted and intelligence gathered and collated. By the end of 1943, the force had been reorganised into two main zones: Assam Zone, including Imphal and all the frontier north of it, and Arakan Zone to the south. The detachments in Tripura were disbanded, as they were deep inside India and unlikely to be threatened; an American organisation later took over the northernmost areas around Ledo.
When the Indian Eastern Army carried out a small-scale invasion of Japanese-occupied Arakan in early 1943, V Force provided timely warning of the movements of Japanese reserves to the threatened area. However, this did not prevent the Japanese inflicting a defeat, due to the exhaustion, inadequate training and poor morale of many British and Indian units.
The commander of V Force, Brigadier P.C. Marindin, was transferred to take command of the Lushai Brigade, an ad-hoc Long Range Penetration brigade formed from Indian infantry battalions and several thousand of V Force's former levies in the Lushai Hills, west of Imphal. They achieved great success against the lines of communication of the Japanese 33rd Division, and later spearheaded Fourteenth Army's advance to the Ayeyarwady River west of the Chindwin River.
When the Japanese retreated late in 1944 and the Allies advanced, V Force changed its character. Small detachments of native-speaking personnel operated immediately ahead of the advancing regular formations, to gather short-range intelligence. A very similar unit, Z Force established by Fourteenth Army operated further ahead, its parties being deployed by helicopter or parachute 80 - 100 miles (120 - 160 km) ahead of the main forces.
Once Burma was largely reoccupied in 1945, V Force began deploying parties in Siam and Malaya in readiness for future operations. The war ended before they could be used in their intended role.
Regular formation commanders were occasionally scathing about the intelligence provided by V Force. One such was Lieutenant-General Geoffrey Scoones, Commander of Indian IV Corps. Concerning the arrival of Japanese reinforcements at the height of the Battle of Imphal, he wrote:
Scoones was not referring to V Force alone. However, one of his subordinates at Imphal (Major-General Douglas Gracey, commanding Indian 20th Infantry Division) broke up his best battalion (9/12 Frontier Force Regiment) to provide his own forward screen, rather than relying on V Force.
For most of the Burma campaign, Allied formation commanders treated reports from organisations such as V Force as reliable only when a British officer personally gained the information. V Force was also hampered by lack of Japanese translators or interpreters to deal with captured documents.