British Expeditionary Force (World War II)

The British Expeditionary Force was the contingent of the British Army sent to France in 1939 after Britain and France declared war on Nazi Germany on 3 September, beginning the Second World War. The BEF existed from 2 September 1939 when the BEF GHQ was formed until 31 May 1940, when GHQ closed down and its troops reverted to the command of Home Forces. During the 1930s, the British government had planned to deter war by abolishing the Ten Year Rule and rearming from the very low level of readiness of the early 1930s. The bulk of the extra money went to the Royal Navy and the Royal Air Force but plans were made to re-equip a small number of Army and Territorial Army divisions for service overseas.
General Lord Gort was appointed to the command of the BEF on 3 September 1939 and the BEF began moving to France on 4 September 1939. The BEF assembled along the Belgian–French border. The BEF took their post to the left of the French First Army under the command of the French 1st Army Group of the North-Eastern Front. Most of the BEF spent the Phoney War digging field defences on the border. When the Battle of France began on 10 May 1940, the BEF constituted 10 per cent of the Allied forces on the Western Front.
The BEF participated in the Dyle Plan, a rapid advance into Belgium to the line of the Dyle River, but the 1st Army Group had to retreat rapidly through Belgium and north-western France, after the German breakthrough further south at the Battle of Sedan. A local counter-attack at the Battle of Arras was a considerable tactical success but the BEF, French and Belgian forces north of the Somme River retreated to Dunkirk on the French North Sea coast soon after, British and French troops being evacuated in Operation Dynamo to England after the capitulation of the Belgian army.
Saar Force, the 51st Infantry Division and reinforcements, had taken over part of the Maginot Line for training. The force fought with local French units after 10 May, then joined the Tenth Army south of the Somme, along with the improvised Beauman Division and the 1st Armoured Division, to fight in the Battle of Abbeville. The British tried to re-build the BEF with Home Forces divisions training in Britain, troops evacuated from France and lines-of-communications troops south of the Somme but BEF GHQ was not reopened.
After the success of the second German offensive in France, the 2nd BEF and Allied troops were evacuated from Le Havre in Operation Cycle and the French Atlantic and Mediterranean ports in Operation Aerial. The Navy rescued 558,032 people, including 368,491 British troops but the BEF lost of whom killed or died of wounds, and missing or captured. About 700 tanks, 20,000 motor bikes, 45,000 cars and lorries, 880 field guns and 310 larger equipments, about 500 anti-aircraft guns, 850 anti-tank guns, 6,400 anti-tank rifles and 11,000 machine-guns were abandoned. As units arrived in Britain they reverted to the authority of the Commander-in-Chief, Home Forces.

History

Background

1918–1932

After 1918, the prospect of war seemed so remote, that Government expenditure on the armed forces was determined by the assumption that no great war was likely. Spending varied from year to year and between the services but from July 1928 to March 1932, the formula of the Committee of Imperial Defence was
and spending on equipment for the army varied from £1,500,000 to £2,600,000 per year from 1924 to 1933, averaging £2,000,000 or about 9 per cent of armaments spending a year. Until the early 1930s, the War Office intended to maintain a small, mobile and professional army and a start was made on motorising the cavalry and the artillery. By 1930, the Royal Army Service Corps had been mechanised, some of the artillery could be moved by tractors, and a few engineer, signals and cavalry units had received lorries. From 1930–1934, the Territorial Army artillery, engineer, signals units were equipped with lorries and in 1938 the regular army gained its establishment of wheeled vehicles and half of its tracked vehicles, except for tanks. From 1923 to 1932, vehicles were ordered at a rate of about year, just under half being six-wheeler lorries. By 1936, the army had of which light tanks and mediums; considered obsolete; the light tanks were modern but did not begin to reach the army until 1935. The rule had reduced war spending from £766 million in 1920 to £102 million when it was abolished on 23 March 1932. The British army had fewer men than in 1914, no organisation or equipment for a war in Europe, and it would have taken the War Office three weeks to mobilise only an infantry division and a cavalry brigade.

Rearmament

Limited Liability

In March 1932, the Ten-Year Rule was abolished and in 1934, the Cabinet resolved to remedy equipment deficiencies in the armed forces over the next five years. The army was always the least favoured force but equipment spending increased from £6,900,000 from 1933–1934 financial year, to £8,500,000 the following year and to more than £67,500,000 by 1938–1939 but the share of spending on army equipment only grew beyond 25 per cent of all military equipment spending in 1938. The relative neglect of the army led to a theory of "limited liability" until 1937, in which Britain would not send a great army to Europe in time of war. In 1934, the Defence Requirements Sub-Committee of the CID assumed that a regular field army of five divisions was to be equipped as an expeditionary force, eventually to be supplemented by parts of the Territorial Army. The force and its air support would act as a deterrent greatly disproportionate to its size; plans were made to acquire sufficient equipment and training for the TA to provide a minimum of two extra divisions on the outbreak of war. It was expected that a British army in Europe would receive continuous reinforcement and in 1936, a TA commitment of twelve divisions was envisaged by Duff Cooper, the Secretary of State for War.
As rearmament of the navy and the air force continued, the nature of an army fit to participate in a European war was kept under review and in 1936, the Cabinet ordered the Chiefs of Staff Sub-Committee of the CID to provide a report on the role of an expeditionary force and the relative values of the army and the air force as deterrents for the same cost. The chiefs were in favour of a balanced rearmament but within financial limits, the air force should be favoured. In 1937, the Minister argued that a continental commitment was no longer feasible and that France did not now expect a big land army along with the navy and air force, Germany had guaranteed Belgian neutrality and that if the quantity of money was limited, defence against air attack, trade protection and the defence of overseas territories were more important and had to be secured before Britain could support allies in the defence of their territories. The "continental hypothesis" came fourth and the main role of the army was to protect the empire, which included the anti-aircraft defence of the United Kingdom. In 1938, "limited liability" reached its apogee, just as rearmament was maturing and the army was considering the "new conspectus", a much more ambitious rearmament plan.
In February 1938, the CID ruled that planning should be based on "limited liability"; between late 1937 and early 1939, equipment for the five-division field army was reduced to that necessary for colonial warfare in the Far East. In Europe, the field force could only conduct defensive warfare and would need a big increase in ammunition and the refurbishment of its tank forces. The field force continued to be the least-favoured part of the least-favoured military arm and in February 1938, the Secretary of State for War, Leslie Hore-Belisha, warned that possible allies should be left in no doubt about the effectiveness of the army. The re-armament plans for the field force remained deficiency plans, rather than plans for expansion. The July 1934 deficiency plan was estimated at £10,000,000 but cut by 50 per cent by the cabinet; by the first rearmament plan of 1936, the cost of the deficiency plan for the next five years had increased to £177,000,000. In the first version of the "new conspectus", spending was put at £347,000,000, although in 1938 this was cut to £276,000,000, still substantially more than the deficiency plan for 1936 but much of this sum was for anti-aircraft defence, a new duty imposed on the army.

Continental commitment

Obtaining equipment for the Field Force benefited from plans for the TA which, sometimes covertly, was used as a device to get more equipment which could be used by the regular army. At first it was admitted in the deficiency programmes of 1935–1936, in which an expansion of the TA in three stages to twelve divisions was to complement the five regular divisions. The Cabinet postponed this plan for three years, during which the policy of limited liability precluded such developments, except for the purchase of the same training equipment for the TA as that used by the army, equivalent to that needed to equip two regular divisions, which was the maximum commitment promised to the French in 1938. The mobile division was split into two divisions and some extra equipment went to artillery and engineer units. By 1938 the deficiency programme was due to mature; in the wake of the Munich Crisis in September and the loss of the 35 divisions of the Czechoslovak Army, the Cabinet approved a plan for a ten-division army equipped for continental operations and a similar-sized TA, in early 1939. By reacting to events, the British Cabinet made it inevitable that
The British made a commitment on 21 April 1939 to provide an army of six regular and 26 Territorial divisions, introduced equipment scales for war and began conscription to provide the manpower. In February 1939, the first four regular army divisions of the Field Force had been promised to the French, scheduled to reach the assembly area in France on the thirtieth day after mobilisation. Until this commitment, no staff work had been done, there was no information about French ports and railways and no modern maps.