Question: Which 1938 book of observations from the Spanish Civil War was written by the author who fought in it with the British Independent Labour Party?

Context paragraphs:
Unendorsed Labour candidates, 1931: At the British general election of 1931, 25 candidates closely connected to the Labour Party stood for election without the party's official endorsement, primarily as a result of disagreements over changes in the party's rules introduced shortly before the election.  All but one of the candidates were members of the Independent Labour Party which was then affiliated to the Labour Party; the remaining candidate had been adopted by a Constituency Labour Party whom the central party thought lacked the finance and organisation to fight the election.  Six of these candidates were elected, one of whom through an unopposed nomination.

James Maxton: James Maxton (22 June 1885 – 23 July 1946) was a Scottish far-left politician, and leader of the Independent Labour Party.  He was a pacifist who opposed both world wars.  A prominent proponent of Home Rule for Scotland, he is remembered as one of the leading figures of the Red Clydeside era.  He broke with Ramsay MacDonald and the second Labour administration, and became one of its most bitter critics.  As the leader of the Independent Labour Party (ILP), he disaffiliated the ILP from the mainstream party in 1932.  After that he was a marginal independent figure on the far left-wing.  His biographer Graham Walker concludes:

Independent Labour Party (Manitoba, 1920): "Prior to 1920, there were a number of groups in Winnipeg which called themselves the "Independent Labour Party".  For information on these groups, see Independent Labour Party (Manitoba, 1895)."

Independent Labour Group: The Independent Labour Group was a nationalist political party in Northern Ireland from the late 1950s to the mid-1960s.  Sometimes known as the Independent Labour Party, it was formed in 1958 in Belfast by independent Labour MP Frank Hanna, with the support of various local Roman Catholic clerics.  That year, the party wiped out the Irish Labour Party on Belfast City Council.

ILP Contingent: The British Independent Labour Party sent a small contingent to fight in the Spanish Civil War.  The contingent fought alongside the Workers' Party of Marxist Unification (POUM) and included George Orwell, who subsequently wrote about his experiences in his personal account "Homage to Catalonia".

Homage to Catalonia: Homage to Catalonia is George Orwell's personal account of his experiences and observations in the Spanish Civil War.  The first edition was published in the United Kingdom in 1938.  The book was not published in the United States until February 1952, when it appeared with an influential preface by Lionel Trilling.  The only translation published in Orwell's lifetime was into Italian, in December 1948.  A French translation by Yvonne Davet—with whom Orwell corresponded, commenting on her translation and providing explanatory notes—in 1938–39, was not published until five years after Orwell's death.

Independent Labour Publications: Independent Labour Publications is a left-wing pressure group inside the British Labour Party.  It is the successor to the Independent Labour Party and is mostly known simply as "The ILP" in order to maintain that link with its predecessor organisation.

Labour candidates and parties in Canada: There have been various groups in Canada that have nominated candidates under the label Labour Party or Independent Labour Party or other variations from the 1870s until the 1960s.  These were usually local or provincial groups using the Labour Party or Independent Labour Party name, backed by local Labour Councils (made up of many union locals in a particular city) or individual trade unions.  There was an attempt to create a national Canadian Labour Party in the late 1910s and in the 1920s, but these were partly successful.

E. T. Kingsley: Eugene Thornton Kingsley (1856 – December 9, 1929) was a founder and leader of the Socialist Party of Canada and an editor of the "Western Clarion" newspaper, one of the most prominent left wing publications in Canada before World War I, in the first decade of the 20th century.  He ran for Parliament in the riding of Vancouver City in the 1908 and 1911 federal elections as a candidate of the Socialist Party of Canada and in the 1926 federal election in the riding of Vancouver Centre as a candidate of the British Columbia Independent Labour Party.  He also ran for the British Columbia Legislative Assembly in the 1907 and 1909 provincial elections.  He served as editor of the "Western Clarion" from 1903 until 1908 and was later active in the British Columbia Federated Labour Party where he served as a vice-president and eventually the British Columbia Independent Labour Party.  In 1919, he edited the weekly paper, Labour Star, which survived for a few months.

The Labour Pioneer: The Labour Pioneer was a monthly socialist periodical issued from Cardiff, Wales between February 1900 and November 1902.  It was an organ of the Cardiff Socialist Party and the Cardiff Trades Council.  It carried the by-line 'Organ of the Cardiff Socialist Party'.  The Cardiff Socialist Party had been formed in 1900 by the fusion of the local Cardiff branches of the Independent Labour Party and the Social Democratic Federation.  The editorial board of "The Labour Pioneer" contained various representatives of local trade councils and trades unions.  However whilst officially being a publication of the local Labour Representation Committee, "The Labour Pioneer" functioned as an unofficial Independent Labour Party organ.

Supporting paragraphs: ILP Contingent Homage to Catalonia
Answer: Homage to Catalonia