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A reverse slope defence is a military tactic where a defending force is positioned on the slope of an elevated terrain feature such as a hill, ridge, or mountain, on the side opposite from the attacking force. [1] This tactic both hinders the attacker's ability to observe the defender's positions and reduces the effectiveness of the attacker's long-range weapons such as tanks and artillery.
A defending unit usually does not conduct a reverse-slope defence along its entire front, as positioning troops on the forward slope is necessary to control the region in front of the hill. However, when enemy forces are known to have superior long-range direct-fire or indirect-fire weapons, the majority of the defending force can use the hill to limit enemy observation and reduce the effectiveness of the long-range enemy fire. This tactic may even succeed in deceiving the enemy as to the true location and organisation of the main defensive positions. Typically, a smaller unit is still posted on the forward slope to perform observation and delay attackers if the defending force needs to relocate its main body onto the forward slope. Otherwise, when the attacker advances and passes over the top of the hill, they may be ambushed by short-range fire from the defender on the reverse slope and perhaps on the counterslope (the forward slope of a hill facing the reverse slope). Combat vehicles are vulnerable when cresting hills, because their thin belly armour may be exposed to troops on the reverse slope and because their weapons may lack the depression angle to effectively engage an enemy located below the vehicle.
The best-known proponent of the tactic was the Duke of Wellington, who used it repeatedly during the Napoleonic Wars to defeat French infantry, such as at the Battle of Waterloo. By placing a ridge between his own army and his opponent's, and having his troops lie down, Wellington was able both to better protect his troops from French artillery fire and to strike the attacking French infantry by having his troops stand up at the last moment and deliver volleys of musketry at close range. At Waterloo, the last major military engagement of the Napoleonic Wars, Wellington utilized this tactic to drive away a last minute infantry attack by the French in a final attempt to gain victory by Napoleon. The French infantry had climbed a ridge only to find it seemingly abandoned and covered with bodies. Suddenly, 1,500 British Foot Guards under Maitland who had been lying down under the ridge rose and unleashed upon them close range, point-blank volleys, killing 300 with the very first volley alone, resulting in the decimation of a large part of Napoleon's elite infantry reserve, the hitherto undefeated Imperial Guard, followed by a British charge which resulted in the retreat and collapse of the French lines, turning the tide of the Battle into a decisive Anglo-Prussian victory and marking the end of the Napoleonic Wars. [2] [lower-alpha 1]
Examples of reverse slope defense during the American Civil War included Stonewall Jackson's defense of Henry House Hill during the First Battle of Bull Run (also known as Manassas) (1861), where he ordered his soldiers to lie down below the crest of the hill in order to avoid Union artillery, and Winfield Scott Hancock's counter-attack against Jubal Early at the Battle of Williamsburg (1862). The Battle of Gettysburg (1863) was another example, especially the Union defense against Pickett's Charge, which was greatly aided by the reverse slope of Cemetery Ridge that both protected and hid infantry and large numbers of cannons that could not be easily seen by the attackers.
Germany employed the reverse slope defence on the Hindenburg Line on the Western Front during the latter part of World War I. The belligerents on both sides on the Western Front had settled into a war of attrition fought from established trenches. Patches of territory were won or lost only at great cost. Years of attrition had left both sides stretched thin in manpower and materiel along the front. Germany recognised this problem early and devised Operation Alberich as an answer to it. Operation Alberich involved the construction, through the late winter of 1917, of a new and shorter line (the Hindenburg Line) of defensive fortifications along a high ridge using reverse slope techniques, with massive artillery gun placements protected to the rear by the topography of the ridge, followed by a strategic retreat from their existing tattered front to positions behind the new line.
After the capture of Carentan by American paratroopers, German forces (elements of the 17th SS Panzergrenadier Division and 6th Fallschirmjäger Regiment) counterattacked in an attempt to recapture this strategically vital town on 13 June 1944. Elements of the U.S. 101st Airborne Division (502nd and 506th Parachute Infantry Regiments (PIR)) met the enemy advance southwest of Carentan at the Battle of Bloody Gulch.
The terrain offered the Americans the opportunity of a reverse slope defence, and three companies of the 506th PIR lined up along the hedgerows at the bottom of Hill 30. The American troops were outnumbered and being hit with tank and assault gun fire, but the reverse incline enabled them to direct all their firepower at the Germans as they appeared over the top of the hill. Although they were almost overrun, their position gave them enough of an advantage to hold their ground until they were relieved by the U.S. 2nd Armored Division. [3]
Reverse slope defenses were very popular with the Japanese during the island campaigns in the Pacific theater. American superiority in naval support artillery prompted the Japanese to shelter on reverse slopes until they could engage American troops at close range.
The Battle of Waterloo was fought on Sunday 18 June 1815, near Waterloo, marking the end of the Napoleonic Wars. A French army under the command of Napoleon was defeated by two armies of the Seventh Coalition. One of these was a British-led force with units from the United Kingdom, the Netherlands, Hanover, Brunswick, and Nassau, under the command of the Duke of Wellington. The other comprised three corps of the Prussian army under Field Marshal Blücher; a fourth corps of this army fought at the Battle of Wavre on the same day. The battle was known contemporarily as the Battle of Mont Saint-Jean in France and La Belle Alliance in Prussia.
Combined arms is an approach to warfare that seeks to integrate different combat arms of a military to achieve mutually complementary effects—for example, using infantry and armour in an urban environment in which each supports the other.
The Battle of Vimy Ridge was part of the Battle of Arras, in the Pas-de-Calais department of France, during the First World War. The main combatants were the four divisions of the Canadian Corps in the First Army, against three divisions of the German 6th Army. The battle occurred from 9 to 12 April 1917, marking the commencement of the Battle of Arras and serving as the inaugural assault of the Nivelle Offensive. The objective was to draw German reserves away from the French forces, preparing for a crucial offensive along the Aisne and the Chemin des Dames ridge several days later.
Trench warfare is a type of land warfare using occupied lines largely comprising military trenches, in which combatants are well-protected from the enemy's small arms fire and are substantially sheltered from artillery. It became archetypically associated with World War I (1914–1918), when the Race to the Sea rapidly expanded trench use on the Western Front starting in September 1914.
A frontal assault is a military tactic which involves a direct, full-force attack on the front line of an enemy force, rather than to the flanks or rear of the enemy. It allows for a quick and decisive victory, but at the cost of subjecting the attackers to the maximum defensive power of the enemy; this can make frontal assaults costly even if successful, and often disastrously costly if unsuccessful. It may be used as a last resort when time, terrain, limited command control, or low troop quality do not allow for any battlefield flexibility. The risks of a frontal assault can be mitigated by the use of heavy supporting fire, diversionary attacks, the use of cover, or infiltration tactics.
Anti-tank warfare originated during World War I from the desire to develop technology and tactics to destroy tanks. After the Allies deployed the first tanks in 1916, the German Empire introduced the first anti-tank weapons. The first developed anti-tank weapon was a scaled-up bolt-action rifle, the Mauser 1918 T-Gewehr, that fired a 13.2 mm cartridge with a solid bullet that could penetrate the thin armor used by tanks at that time and destroy the engine or ricochet inside, killing occupants. Because tanks represent an enemy's strong force projection on land, military strategists have incorporated anti-tank warfare into the doctrine of nearly every combat service since. The most predominant anti-tank weapons at the start of World War II in 1939 included the tank-mounted gun, anti-tank guns and anti-tank grenades used by the infantry, and ground-attack aircraft.
Enfilade and defilade are concepts in military tactics used to describe a military formation's exposure to enemy fire. A formation or position is "in enfilade" if weapon fire can be directed along its longest axis. A unit or position is "in defilade" if it uses natural or artificial obstacles to shield or conceal itself from enfilade and hostile fire. The strategies, named by the English during the Hundred Years' War, use the French enfiler and défiler spoken by English nobility of the time.
The Battle of Arras was a British offensive on the Western Front during the First World War. From 9 April to 16 May 1917, British troops attacked German defences near the French city of Arras on the Western Front. The British achieved the longest advance since trench warfare had begun, surpassing the record set by the French Sixth Army on 1 July 1916. The British advance slowed in the next few days and the German defence recovered. The battle became a costly stalemate for both sides and by the end of the battle, the British Third Army and the First Army had suffered about 160,000 casualties and the German 6th Army about 125,000.
An infantry square, also known as a hollow square, was a historic close order formation used in combat by infantry units, usually when threatened with cavalry attack. To deploy its weapons effectively, a traditional infantry unit would generally form a line; but the line was vulnerable to more nimble cavalry, which could sweep around the end of the line, or burst through it, and then attack the undefended rear or simply sweep along the line attacking the individual footsoldiers successively. By arranging the unit so that there was no undefended rear or flank, an infantry commander could organise an effective defense against cavalry attack. With the development of modern firearms and the demise of cavalry, the square formation is now considered obsolete.
Defeat in detail, or divide and conquer, is a military tactic of bringing a large portion of one's own force to bear on small enemy units in sequence, rather than engaging the bulk of the enemy force all at once. This exposes one's own units to many small risks but allows for the eventual destruction of an entire enemy force.
The Second Battle of the Aisne was the main part of the Nivelle Offensive, a Franco-British attempt to inflict a decisive defeat on the German armies in France. The Entente strategy was to conduct offensives from north to south, beginning with an attack by the British Expeditionary Force (BEF) then the main attack by two French army groups on the Aisne. General Robert Nivelle planned the offensive in December 1916, after he replaced Joseph Joffre as Commander-in-Chief of the French Army.
The Battle of Messines was an attack by the British Second Army, on the Western Front, near the village of Messines in West Flanders, Belgium, during the First World War. The Nivelle Offensive in April and May had failed to achieve its more grandiose aims, had led to the demoralisation of French troops and confounded the Anglo-French strategy for 1917. The attack forced the Germans to move reserves to Flanders from the Arras and Aisne fronts, relieving pressure on the French.
Infantry tactics are the combination of military concepts and methods used by infantry to achieve tactical objectives during combat. The role of the infantry on the battlefield is, typically, to close with and engage the enemy, and hold territorial objectives; infantry tactics are the means by which this is achieved. Infantry commonly makes up the largest proportion of an army's fighting strength, and consequently often suffers the heaviest casualties. Throughout history, infantrymen have sought to minimise their losses in both attack and defence through effective tactics.
The Battle of Heartbreak Ridge, also known as the Battle of Wendengli, was a month-long battle in the Korean War which took place between 13 September and 15 October 1951. After withdrawing from Bloody Ridge, the Korean People's Army (KPA) set up new positions just 1,500 yards (1,400 m) away on a 7-mile (11 km) long hill mass. If anything, these defenses were even more formidable than on Bloody Ridge.
The Second Battle of Champagne in the First World War was a French offensive against the German army at Champagne that coincided with the Third Battle of Artois in the north and ended with a French defeat.
In military tactics, a flanking maneuver is a movement of an armed force around an enemy force's side, or flank, to achieve an advantageous position over it. Flanking is useful because a force's fighting strength is typically concentrated in its front, therefore, to circumvent an opposing force's front and attack its flank is to concentrate one's own offense in the area where the enemy is least able to concentrate defense.
Shock tactics, shock tactic, or shock attack is an offensive maneuver which attempts to place the enemy under psychological pressure by a rapid and fully-committed advance with the aim of causing their combatants to retreat. The acceptance of a higher degree of risk to attain a decisive result is intrinsic to shock actions.
The Battle of Keren took place from 3 February to 27 March 1941. Keren was attacked by the British during the East African Campaign of the Second World War. A force of Italian regular and colonial troops defended the position against British troops and Free French forces. The town of Keren, in the colony of Italian East Africa, was of tactical importance to both sides. The road and railway through Keren were the main routes to the colonial capital of Italian Eritrea at Asmara and the Red Sea port of Massawa, which surrendered to the British after the battle.
In military usage, a barrage is massed sustained artillery fire (shelling) aimed at a series of points along a line. In addition to attacking any enemy in the kill zone, a barrage intends to suppress enemy movements and deny access across that line of barrage. The impact points along the line may be 20 to 30 yards apart, with the total line length of the barrage zone anything from a few hundred to several thousand yards long. Barrages can consist of multiple such lines, usually about 100 yards apart, with the barrage shifting from one line to the next over time, or several lines may be targeted simultaneously.
Napoleonic tactics describe certain battlefield principles used by national armies from the late 18th century until the invention and adoption of the rifled musket in the mid 19th century. Napoleonic tactics are characterised by intense drilling of soldiers; speedy battlefield movement; combined arms assaults between infantry, cavalry, and artillery; relatively small numbers of cannons; short-range musket fire; and bayonet charges. French Emperor Napoleon I is considered by military historians to have been a master of this particular form of warfare. Military powers would continue to employ such tactics even as technological advancements during the industrial revolutions gradually rendered them impractically obsolete, leading to devastating losses of life in the American Civil War, the Franco-Prussian War, and World War I.