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The 18th Infantry Division was an infantry division of the British Army which fought briefly in the Malayan Campaign of the Second World War. In March 1939, after the re-emergence of Germany as a European power and its occupation of Czechoslovakia, the British Army increased the number of divisions in the Territorial Army (TA) by duplicating existing units. The 18th Infantry Division was formed in September 1939 as a second-line duplicate of the 54th (East Anglian) Infantry Division, with men from Essex and the East Anglian counties of Norfolk, Suffolk and Cambridgeshire. The division was based in Britain from 1939 to 1941, undergoing training and being moved around the country. This included an anti-invasion role in East Anglia, training in Scotland, and redeployment to the North West where the division also helped unload merchant ships during the Liverpool Blitz. Towards the end of 1941, the British government sought to reinforce the British Army in North Africa to demonstrate to the Dominions that the United Kingdom was doing its fair share of fighting in the Middle East and to prepare for Operation Crusader. The division left Britain during October bound for Egypt. By December, the convoy had reached South Africa and was preparing for the final stretch of its journey when news of the Japanese entry into the war was received. This resulted in most of the 18th Infantry Division being diverted to India to reinforce British forces facing the Japanese. The 53rd Brigade was sent to Singapore, from where it was deployed north to Johore and became embroiled in the Battle of Muar. After several short engagements with Japanese forces, the brigade was withdrawn to Singapore Island. Between 29 January and 5 February, the rest of the division arrived in Singapore having sailed from India. Shortly afterwards, the entire division participated in the Battle of Singapore. Initially deployed to northeastern Singapore Island, the division remained largely inactive while the Japanese attacked the north-west sector. Following the establishment of a Japanese beachhead, the division was broken up and deployed piecemeal in the battle. One battalion was assigned to a different formation and several units formed two battlegroups. After the initial engagements, the division was regrouped for a final stand in the city of Singapore and repulsed several Japanese attacks. The division, with the rest of the garrison, surrendered to the Japanese on 15 February 1942. It was not reconstituted. Over one-third of the division's personnel died in captivity, including divisional commander Major-General Merton Beckwith-Smith.

The 23rd (Northumbrian) Division was an infantry division of the British Army, which fought briefly in the Battle of France during the Second World War. In March 1939, after the re-emergence of Germany as a European power and its occupation of Czechoslovakia, the British Army increased the number of divisions within the Territorial Army by duplicating existing units. The 23rd (Northumbrian) Division was formed in October 1939, as a second-line duplicate of the 50th (Northumbrian) Motor Division. It was made up of two brigades, unlike regular infantry divisions that were composed of three, with battalions hailing from the north of England. It was intended that the division would remain in the United Kingdom to complete training and preparation, before being deployed to France within twelve months of the war breaking out. The division spent little time training and its soldiers were dispersed and used to guard strategically important and vulnerable locations across North East England. Guard duty and little preparation for war were seen as a hindrance to good morale. In France, the British Expeditionary Force (BEF) was suffering from a manpower shortage among rear-line units. To boost morale, provide additional labour and guards for the rear echelon of the BEF, and score political points with the French Government and military, the division was sent to France in April 1940, leaving behind most of its administration and logistical units as well as heavy weapons and artillery. The men were assigned to aid in the construction and guarding of airfields. The Chief of the Imperial General Staff, Edmund Ironside, secured a promise from the BEF that the division would not be used in action owing to it being untrained and incomplete. When Germany invaded Belgium and the Netherlands, the BEF and French armies moved to meet the attack, leaving behind the 23rd Division to continue guarding airfields. The main German attack came through the Ardennes and moved to cut off the British and French forces in northern France. With no other reserves available, the 23rd Division was ordered to the front line to defend the Canal du Nord—the only watercourse obstacle between the main German assault and the English Channel—and the only defensible position at which to stop the German attempt to encircle the BEF. By the time the division arrived at the canal, the Germans had already crossed south of their sector where French forces had yet to take up positions. Having destroyed the bridges in their area, the division was ordered to fall back to new positions to defend the town of Arras. Before the 70th Infantry Brigade could take up this new position, it was caught by advancing German armoured forces and overrun. The military situation further deteriorated, resulting in the decision to begin the Dunkirk evacuation. Elements of the division conducted delaying and rearguard actions around the perimeter before being evacuated on 31 May 1940, having suffered heavy losses. In Britain, the division was disbanded and its units were transferred to other formations to bring them up to strength.

The 2nd Infantry Division was an infantry division of the British Army that was formed and disestablished numerous times between 1809 and 2012. It was raised by Lieutenant-General Arthur Wellesley for service in the Peninsular War (part of the Coalition Wars of the Napoleonic Wars) as the 2nd Division. It was disestablished in 1814, but re-formed the following year for service in the War of the Seventh Coalition. The formation fought at the Battle of Waterloo and played an important role in defeating the final French attack of the day. It then marched into France and became part of the Army of Occupation, and was the only British force allowed to march through Paris. In December 1818, the division was disbanded once again. During the mid- to late-19th century, several formations bearing the name 2nd Division were formed. Only two such were considered part of the division's lineage by Everard Wyrall, who compiled its First World War history. The first was created in 1854 to take part in the Crimean War against the Russian Empire, fighting in the Battle of Inkerman and throughout the Siege of Sevastopol. In 1856, after the conclusion of hostilities, it was stood down. The second incarnation was raised in 1899 for the Second Boer War. It took part in all the battles that made up the Relief of Ladysmith, before advancing into Boer territory. At the end of 1900, when conventional warfare ended, the division was broken up so its forces could be reassigned to mobile columns or to garrison towns in an effort to combat the Boer guerrilla tactics.

The 38th (Welsh) Division (initially the 43rd Division, later the 38th (Welsh) Infantry Division and then the 38th Infantry (Reserve) Division) of the British Army was active during both the First and Second World Wars. In 1914, the division was raised as the 43rd Division of Herbert Kitchener's New Army, and was originally intended to form part of a 50,000-strong Welsh Army Corps that had been championed by David Lloyd George; the assignment of Welsh recruits to other formations meant that this concept was never realised. The 43rd was renamed the 38th (Welsh) Division on 29 April 1915, and shipped to France later that year. It arrived in France with a poor reputation, seen as a political formation that was ill-trained and poorly led. The division's baptism by fire came in the first days of the Battle of the Somme, where it captured Mametz Wood at the loss of nearly 4,000 men. This strongly held German position needed to be secured in order to facilitate the next phase of the Somme offensive, the Battle of Bazentin Ridge. Despite securing its objective, the division's reputation was adversely affected by miscommunication among senior officers. A year later the division made a successful attack in the Battle of Pilckem Ridge, the opening of the Third Battle of Ypres. This action redeemed the division in the eyes of the upper hierarchy of the British military. In 1918, during the German spring offensive and the subsequent Allied Hundred Days Offensive, the division attacked several fortified German positions. It crossed the Ancre River, broke through the Hindenburg Line and German positions on the River Selle, ended the war on the Belgian frontier, and was considered one of the Army's elite units. The division was not chosen to be part of the Occupation of the Rhineland after the war, and was demobilised over several months. It ceased to exist by March 1919. In March 1939, following the reemergence of Germany and its occupation of Czechoslovakia, the British army increased the number of divisions within the Territorial Army by duplicating existing units. On paper, the division was recreated as the 38th (Welsh) Infantry Division, a duplicate of the 53rd (Welsh) Infantry Division. It was formed in September 1939, however it was never deployed overseas as a division, having been restricted to home defence duties around the United Kingdom. In 1944, it was disbanded and its units were either deployed or broken up to reinforce the 21st Army Group in Normandy during Operation Overlord. The 38th Division was recreated on 1 September 1944 as the 38th Infantry (Reserve) Division, a training formation that took over the role previously occupied by the 80th Infantry (Reserve) Division. In this form, the division completed the training of recruits, who were then dispatched overseas as reinforcements. At the end of the war, the division was again stood down.

The 70th Infantry Division was an infantry division of the British Army that fought during the Western Desert Campaign of the Second World War. What would become the 70th Division originated with the 7th Infantry Division, which was formed in 1938 to serve in the British Mandate of Palestine during the Arab Revolt. This division then transferred to Egypt on the outbreak of the Second World War and soon became the 6th Infantry Division, which went on to take part in the Battle of Crete and the Syria–Lebanon Campaign. On 10 October 1941, the 6th Division was re-created as the 70th Infantry Division, in an attempt to deceive Axis intelligence concerning the strength of British forces in the Middle East. The Royal Navy transported the division to Tobruk from 19 September to 25 October, in a politically controversial move to relieve the mainly Australian garrison which had been defending the port for almost seven months, since the beginning of the siege of Tobruk. Under daily aerial and artillery attacks, the division defended the port and conducted nightly offensive patrols against German and Italian positions. On 18 November, the British Eighth Army launched Operation Crusader. The division was tasked with breaking out of Tobruk, following the destruction of the Axis armoured forces. Following unexpected early success, the division began its attacks on 21 November, before the armoured formations of Germans and Italians had been defeated. Heavy fighting soon followed as the division captured several well-defended and dug-in German and Italian strong points. The looming threat of the Axis tanks ended the break-out offensive the following day. Renewed fighting on 26 November saw the division link up with the approaching New Zealand Division, cutting the Axis lines of communication. In response, the Germans launched several counter-attacks to throw back the 70th Division from the territory they had gained. The failure of these attacks had a lasting strategic impact on Operation Crusader; the Axis forces began their retreat and lifted the siege of Tobruk. Two men—from units attached to the division—were awarded the Victoria Cross for their actions during Operation Crusader. Following the fighting at Tobruk, the division was withdrawn from the front and placed in reserve. When Japan entered the war, the division was transferred to India. It was considered the most experienced and best trained British formation available in Asia. In India, the division formed a reserve to counter possible Japanese landings while it trained in jungle warfare. It also served as a police force, protecting railways and being used to suppress civil disobedience caused by the Quit India Movement. While it was requested that the division be sent to the front line in Burma, it was instead transferred to Special Force, commonly known as the Chindits. Such a move was opposed by the highest military commanders in India and Burma, and proved controversial with the troops themselves. Despite their pleas, the division was broken up and officially ceased to exist on 24 November 1943. Historian Woodburn Kirby and Lieutenant-General William Slim (who led the British troops in Burma) believed that the division could have had a greater impact against the Japanese had it been retained as a single formation.