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((Short description|Military tactic))
((more citations needed|date=April 2014))
A '''reverse slope defence''' is a [[Military tactics|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.<ref>((cite book |last=Datz |first=I. M. |date=1 February 2008 |title=Military Operations Under Special Conditions of Terrain and Weather |publisher=Lancer |pages=132–4 ))</ref>  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 [[tank]]s 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|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 [[ambush]]ed 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.

== Historical examples ==
=== Napoleonic Wars ===

The best-known proponent of the tactic was the [[Arthur Wellesley, 1st Duke of Wellington|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 [[musket]]ry at close range. At Waterloo, the last major military engagement of the Napoleonic Wars, Wellington utilized this tactic to drive away a [[Battle of Waterloo#Attack of the Imperial Guard|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 dead. Suddenly, 1,500 British Foot Guards under [[Peregrine Maitland|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 (Napoleon I)|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.<ref>((Cite book |last=Field |first=Andrew W. |title=Waterloo The French Perspective |publisher=Waterloo The French Perspective |year=2013 |isbn=978-1-78159-043-0 |location=Great Britain |pages=200))</ref>((efn|[http://napoleonistyka.atspace.com/infantry_tactics_4.htm#infantrycombatcolumns Infantry Tactics and Combat during the Napoleonic Wars ~ Part 3 ~ Columns]. This article argues that all armies of the period used column formations at times on the battlefield, the military historian Sir [[Charles Oman]] is credited with developing the theory that the French practically always attacked in heavy columns, and it is only now that this alleged error, propagated by other British and American authors, is being repudiated. (see also [[Historical revisionism#French attack formations in the Napoleonic wars|Historical revisionism: French attack formations in the Napoleonic wars]])))

=== American Civil War ===

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.

=== World War I ===

Germany employed the reverse slope defence on the [[Hindenburg Line]] on the [[Western Front (World War I)|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 [[trench warfare|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.

=== World War II ===

After the [[Battle of Carentan|capture of Carentan]] by American paratroopers, German forces (elements of the [[17th SS Panzergrenadier Division Götz von Berlichingen|17th SS Panzergrenadier Division]] and 6th [[Fallschirmjäger (World War II)|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]].<ref name="Band of Brothers">((cite book |last= Ambrose |first= Stephen E. |title= [[Band of Brothers (book)|Band of Brothers]] |date=September 2001 |isbn= 0-7434-2990-7))</ref>

Reverse slope defenses were very popular with the Japanese during the island campaigns in the [[Asiatic-Pacific Theater|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.

=== Other examples ===
* In the 1966 [[Battle of Long Tan]].
* [[Valley of Tears]], during the 1973 [[Yom Kippur War]]
* In the 1982 [[Battle of Wireless Ridge]], Argentine defensive positions were positioned on the forward slopes. When the British [[2nd Battalion, The Parachute Regiment]] (2 Para) occupied these Argentine positions, they were on a reverse slope, protected from Argentine artillery fire.<ref>((cite web|url=http://www.globalsecurity.org/military/library/report/call/call_1-88_chpt3.htm|title=Reverse Slope Defense: LIGHT INFANTRY IN ACTION|first=John|last=Pike|website=www.globalsecurity.org))</ref>
* In the 1991 [[Battle of 73 Easting]], M1A1 tanks of Eagle Troop led by [[H. R. McMaster|Captain McMaster]] crested a hill and surprised an Iraqi tank company set up in a reverse slope defence on the 70 Easting. They immediately engaged the Iraqi tanks and destroyed the company.

== See also ==
*[[Hull-down#Armoured warfare|Hull-down]]
*[[Enfilade and defilade|Defilade]]

==References==
((reflist|group=lower-alpha))
((reflist))

== External links ==
*[http://www.globalsecurity.org/military/library/report/call/call_1-88_chpt3.htm "Reverse slope defense" - globalsecurity.org]
*[http://www.fas.org/man/dod-101/army/docs/st100-7/chapter06/C6III.htm "Terrain Considerations in the Defense" - fas.org]
*[http://www.lonesentry.com/articles/methods/index.html "Methods of Employing Tanks with Infantry" (see section 11, "Tanks with Infantry") - lonesentry.com]
((Use dmy dates|date=July 2019))

[[Category:Defensive tactics|Reverse slope]]

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