Question: Nickforce was a formation used in the latter stages of a Battle that was a battle of what?

Context paragraphs:
Combat box: The Combat Box was a tactical formation used by heavy (strategic) bombers of the U.S. Army Air Forces during World War II.  The combat box was also referred to as a "staggered formation".  Its defensive purpose was in massing the firepower of the bombers' guns, while offensively it concentrated the release of bombs on a target.

Nickforce: Nickforce was an improvised formation of the British First Army in the Tunisian Campaign of World War II.  It was hastily formed from elements of the British 6th Armoured Division on 14 February 1943, for the defence of Thala, during the latter stages of the Battle of Kasserine Pass.  It took its name from the commanding officer, Brigadier Cameron Nicholson.  In desperate fighting, the force successfully blocked a "Kampfgruppe" of the 10th Panzer Division, under the direct control of "Generalfeldmarschall" Erwin Rommel, on 21 and 22 February.

A formation: In American football, the A formation was a variation of the single-wing formation used with great success by the New York Giants of the 1930s and early 1940s.  This formation was masterminded by Giants coach Steve Owen and relied heavily upon Hall of Fame center Mel Hein for its success.

Finger-four: The "Finger-four" formation (also known as the "four finger formation" and the "Fingertip Formation"), is a flight formation used by fighter aircraft.  It consists of four aircraft, and four of these formations can be combined into a squadron formation.

T formation: In American football, a T formation (frequently called the full house formation in modern usage, sometimes the Robust T) is a formation used by the offensive team in which three running backs line up in a row about five yards behind the quarterback, forming the shape of a "T".

Shotgun formation: The shotgun formation is a formation used by the offensive team in American and Canadian football.  This formation is used mainly for passing plays, although some teams use it as their base formation.  In the shotgun, instead of the quarterback receiving the snap from center at the line of scrimmage, he stands farther behind the line of scrimmage, often five to seven yards back.  Sometimes the quarterback will have a back on one or both sides before the snap, while other times he will be the lone player in the backfield with everyone spread out as receivers.

Battle of Bab El Oued: The Battle of Bab el Oued (French: "Bataille de Bab el Oued" ) was a military confrontation which occurred during the latter stages of the Algerian War (1954–1962).  The battle was between the "Organisation armée secrète" (OAS), a militant group opposed to Algerian independence, and the French army in a traditionally working-class European quarter of Algiers from 23 March to 6 April 1962.

Notre Dame Box: The Notre Dame Box is a variation of the single-wing formation used in American football, with great success by Notre Dame in college football and the Green Bay Packers of the 1920s and 1930s in the NFL.  Green Bay's coach, Curly Lambeau, learned the Notre Dame Box while playing for Knute Rockne in the late 1910s.  Rockne learned it from Jesse Harper, who learned it from coach Amos Alonzo Stagg.  It contained two tight ends, and 4 backs.  The formation often featured an "unbalanced line" where the center (that is, the player who snapped the ball) was not strictly in the "center" of the line, but close to the weakside.

Battle of Kasserine Pass: The Battle of Kasserine Pass was a battle of the Tunisia Campaign of World War II that took place in February 1943.  Kasserine Pass is a 2 mi gap in the Grand Dorsal chain of the Atlas Mountains in west central Tunisia.  The Axis forces, led by "Generalfeldmarschall" Erwin Rommel, were primarily from the "Afrika Korps" Assault Group, elements of the Italian "Centauro" Armoured Division and two Panzer divisions detached from the 5th Panzer Army, while the Allied forces consisted of the U.S. II Corps (Major General Lloyd Fredendall), the British 6th Armoured Division (Major-General Charles Keightley) and other parts of the First Army (Lieutenant-General Kenneth Anderson).

Battle of Chesterfield: The Battle of Chesterfield was a minor skirmish in the latter stages of 13th century England's Second Barons' War.  It was part of the “mopping up” of Baronial opposition that resisted Henry III following the Battle of Evesham.  The fighting took place in, and around, Chesterfield, Derbyshire on 15 May 1266.

Supporting paragraphs: Nickforce Battle of Kasserine Pass
Answer: Tunisia Campaign of World War II