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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 4th Army was a Royal Yugoslav Army formation mobilised prior to the German-led Axis invasion of the Kingdom of Yugoslavia during World War II. It was drawn from the peacetime 4th Army District. When mobilised, it consisted of three divisions, a brigade-strength detachment, one horse cavalry regiment and one independent infantry regiment. It formed part of the 1st Army Group, and was responsible for defending a large section of the Yugoslav–Hungarian border, being deployed behind the Drava river between Varaždin and Slatina. Like all Yugoslav formations at the time, the 4th Army had serious deficiencies in both mobility and firepower. Despite concerns over a possible Axis invasion, orders for the general mobilisation of the Royal Yugoslav Army were not issued by the government until 3 April 1941, in order to not provoke Germany any further following the military coup d'état and precipitate war. When the invasion commenced on 6 April, the 4th Army was only partially mobilised, and this weakness was exacerbated by fifth-column activities within its major units and higher headquarters. Revolts of Croat soldiers broke out in all three divisions in the first few days, causing significant disruption to their mobilisation and deployment. The town of Bjelovar was taken over by rebel troops. Widespread desertions of Croat troops, many of whom turned on their Serb comrades, made control even more difficult. German activity in the 4th Army sector in the first four days included limited objective attacks to seize crossings over the Mura and Drava rivers, along with air attacks by the Luftwaffe. The formation and expansion of German bridgeheads were facilitated by fifth-column elements of the Croatian fascist Ustaše organisation and their sympathisers among the Croat-majority populace of the 4th Army sector. Elements of the 4th Army did put up scattered resistance to the Germans, but it began to withdraw southwards on 9 April, and on 10 April it quickly ceased to exist as an operational formation in the face of two determined armoured thrusts by XXXXVI Motorised Corps from bridgeheads at Zákány and Barcs. The 14th Panzer Division captured Zagreb late that day, and the Germans facilitated the proclamation of an independent Croatian state. A senior staff officer at the headquarters of the 1st Army Group who sympathised with the Ustaše issued orders redirecting formations and units of the 4th Army away from the advancing Germans, and fifth-column elements arrested some 4th Army headquarters staff. Under the leadership of its commander, Armijski đeneral Petar Nedeljković, the mostly ethnic Serb remnants of the 4th Army attempted to establish defensive positions in northeastern Bosnia, but were brushed aside by the 14th Panzer Division as it drove east towards Sarajevo, which fell on 15 April. A ceasefire was agreed on that day, and the remains of the 4th Army were ordered to stop fighting. The Yugoslav Supreme Command surrendered unconditionally effective on 18 April.

The 68th New York Infantry Regiment served in the Union Army during the American Civil War. Also known as the Cameron Rifles or the Second German Rifle Regiment, the men were mostly German immigrants. Organized in July 1861, three months after the outbreak of war, the 68th saw service in the Eastern and Western theaters. As a part of the Army of the Potomac, it was initially assigned to the defenses of Washington, D.C. Later, the 68th was transferred to the Shenandoah Valley and fought at the Battle of Cross Keys. The men of the 68th were then reassigned to central Virginia and found themselves in the thick of the fighting at Second Bull Run. After returning to the nation's capital, the regiment fought in Chancellorsville and was routed by Confederate forces. At Gettysburg, they saw battle on two of the three days and took heavy losses. The regiment was then transferred to the west and participated in the Chattanooga Campaign. The 68th fought in the battles of Wauhatchie and Missionary Ridge, assisting in the Union victories there. The regiment marched to relieve the siege of Knoxville, and then spent the last year of the war on occupation duty in Tennessee and Georgia, before being disbanded in November 1865.

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.

The 7th Army was a Royal Yugoslav Army formation raised prior to the German-led Axis invasion of Yugoslavia in April 1941, during World War II. It consisted of two divisions, two brigade-strength mountain detachments, and a brigade-strength infantry detachment. It formed part of the 1st Army Group, and was responsible for the defence of Yugoslavia's north-western frontier with Italy and Germany. Like all Yugoslav formations at the time, the 7th Army had serious deficiencies in both mobility and firepower. Despite concerns over a possible Axis invasion, orders for the general mobilisation of the Royal Yugoslav Army were not issued by the government until 3 April 1941, not to provoke Germany any further following the military coup d'état and precipitate war. When the invasion commenced on 6 April, the 7th Army was only partially mobilised, and on the first day the Germans seized several mountain passes and bridges over the Drava river. Slovene politicians formed a National Council of Slovenia with the intent of separating from Yugoslavia, and on the right flank of the 7th Army, the 4th Army was seriously weakened by Croat fifth column activities within its major units and higher headquarters from the outset. This alarmed the 7th Army commander, Divizijski đeneral Dušan Trifunović, but he was not permitted to withdraw from the border areas until the night of 7/8 April, and this was followed by the German capture of Maribor on 8 April as they continued to expand their bridgeheads, supported by the Luftwaffe. On 10 April, the German 14th Panzer Division captured Zagreb. Italian offensive operations began the following day, with thrusts towards Ljubljana and down the Adriatic coast that resulted in the capture of more than 30,000 Yugoslav troops near Delnice. When fifth column supporters of the Croatian nationalist Ustaše movement arrested the headquarters staff of the 7th Army later that day, the formation effectively ceased to exist. On 12 April, the 14th Panzer Division linked up with the Italians near the Adriatic coast, encircling the remnants of the 7th Army, which offered no further resistance. Ceasefires were implemented from 15 April, and the Yugoslav Supreme Command surrendered unconditionally effective on 18 April.