Question: Which English writer wrote a non-fictional book about an operation in which 21,000 British troops were deployed?

Context paragraphs:
Shadow Divers: Shadow Divers (published in 2004) is a non-fictional book by Robert Kurson recounting of the discovery of a World War II German U-boat 60 mi off the coast of New Jersey, United States in 1991.

Aye, and Gomorrah, and other stories: Aye, and Gomorrah, and other stories is a collection of stories by American writer Samuel R. Delany, published by Vintage Books in 2003.  It is a thematically arranged collection, in the style of James Joyce’s "Dubliners" (1914), Sherwood Anderson’s "Winesburg, Ohio" (1919), and Willa Cather’s "Youth and the Bright Medusa" (1920).  The book is closely based on an earlier collection, "Driftglass", which first appeared in 1971.  The dedication to the two books is similar: one is simply an updated version of the other, dedicating the book to Delany’s immediate family: his maternal grandmother, mother, sister, and father.  Both carry identical epigraphs.  The ten tales contained in "Driftglass" are all contained in "Aye, and Gomorrah", along with five other stories ("Omegahelm", "Among the Blobs", "Tapestry", "Prismatica", "Ruins").  The stories consist of ten science fiction tales, in the order the writer wrote them, followed by five fantasies, also in chronological order.

I riddarnas spår: I riddarnas spår (in Swedish: In Footprints of the Knights) is a non-fictional book by Norwegian-Swedish fantasy author Margit Sandemo, which deals with De svarta riddarna that was at the time newest of the series of novels by her.  By autumn 1999 she had written 107 books during the last seventeen years and decided have a holiday next seven weeks from writing.  She hired a house from Costa Blanca, Spain, but two days after beginning of the holiday she began wtiting of the next series of novels.  The husband of writer, Asbjørn Sandemo had died earlier in the same year, and she experienced writing of De svarta riddarna as kind of therapy.

The Case for Latvia: The Case for Latvia.  Disinformation Campaigns Against a Small Nation.  Fourteen Hard Questions and Straight Answers about a Baltic Country is the complete title of a non-fictional book on the history of Latvia by the awarded Finnish author Jukka Rislakki.  The book was first published 2007 in the Finnish language.  It was translated to English by Richard Impola and published by the Rodopi publishing house 2008.  An expanded second edition was published January 2014.  The Case for Latvia is part of the series

The India Way: The India Way: How India’s Top Business Leaders Are Revolutionizing Management is published by the Harvard Business Press.  It's a non-fictional book written by Peter Cappelli, Harbir Singh, Jitendra Singh and Michael Useem of the Wharton School at the University of Pennsylvania.  The book was released in the United States on March 23, 2010, and was released in India in May 2010.  "The India Way" primarily focuses on the contrast in business management styles between the U.S. and India.  Topics discussed in the book include topics such as leadership skills, company governance, human resources management and innovation.  The authors’ conclusions are based on an analysis of nearly 130 interviews conducted with Indian CEOs and executives.

Operation Banner: Operation Banner was the operational name for the British Armed Forces' operation in Northern Ireland from August 1969 to July 2007, as part of the Troubles.  It was the longest continuous deployment in the British military's history.  The British Army was initially deployed, at the request of the unionist government of Northern Ireland, in response to the August 1969 riots.  Its role was to support the Royal Ulster Constabulary (RUC) and to assert the authority of the British government in Northern Ireland.  At the peak of the operation in the 1970s, about 21,000 British troops were deployed, most of them from Britain.  As part of the operation, a new locally-recruited regiment was also formed: the Ulster Defence Regiment (UDR).

Greek Summer Offensive (1920): The Greek Summer Offensive of 1920 was an offensive by the Greek army, assisted by British forces, to capture the southern region of the Sea of Marmara and the Aegean Region from the Kuva-yi Milliye (National Forces) of the provisional Turkish national movement government in Ankara.  Additionally, the Greek and British forces were supported by the Kuva-yi Inzibatiye (Forces of Order) of the Ottoman government in Constantinople, which sought to crush the Turkish nationalist forces.  The offensive was part of the Greco-Turkish War and was one of several engagements where British troops assisted the advancing Greek army.  British troops actively took part in invading coastal towns of the Sea of Marmara.  With the approval of the Allies, the Greeks started their offensive on 22 June 1920 and crossed the 'Milne Line'.  The 'Milne Line' was the demarcation line between Greece and Turkey, laid down in Paris.  Resistance by the Turks was limited, as they had few and ill-equipped troops in western Anatolia.  They were also busy on the eastern and southern fronts.  After offering some opposition, they retreated to Eskişehir on Mustafa Kemal Pasha's order.

1st Military Working Dog Regiment: The 1st Military Working Dog Regiment, Royal Army Veterinary Corps is a British Army animal unit.  It is responsible for providing trained dogs and handlers to support the main brigade of British troops deployed to Afghanistan in Operation Herrick.  The regiment was formed on 26 March 2010, and its headquarters is located at Chiron Barracks in Sennelager, Germany.

Ken Wharton (writer): Ken Wharton (born 21 June 1950) is an English writer and former British soldier who has written a series of non-fictional books on the conflict in Northern Ireland known as the Troubles.  The books are based on first-hand accounts by soldiers of all ranks who served in the Operation Banner campaign as well as Wharton's own personal experiences from his two tours of Northern Ireland.

Aden Street riots: The Aden Street riots took place in early 1967 during the Aden Emergency.  On 19-20 January 1967 the NLF prompted street rioting in Aden.  The Aden police lost control, so British High Commissioner Sir Richard Turnbull deployed British troops to crush the riots.  This was followed by pro-FLOSY rioters taking to the streets which then led to conflict with British troops until February.  The mood created by the riots helped lead to the Arab Police mutiny.

Supporting paragraphs: Ken Wharton (writer) Operation Banner
Answer: Ken Wharton