There was a need to produce a history of the Anglo-Irish War in such an enigmatic county as Donegal. The book has a clear sense of the development of SF/IRA organisation, structures and development to 1921.It does read a bit like a catalogue of incidents at times but that is not surprising in a large county like Donegal. The author includes some nice detail, e.g. how the IRA forces in the north of the county were handicapped by the seasonal migration of their men to look for farmwork in Scotland and England.
I have reservations about the book. The Acknowledgements section makes it clear that the book is dependent on personal accounts of mainly SF supporters and sympathisers. Unfortunately, the experiences and organsisations of the loyalists in Donegal, more than a fifth of the county population, receive but sketchy attention. The book deals with many quite minor incidents in the guerilla war but fails to mention some of the more startling incidents which hit the national press. Examples are the Traffic Manager of the County Donegal Railway's seeing off IRA raiders single-handedly with a pistol when they boarded his train at Drumbar in September 1920 and the desecration of Meenglas Church of Ireland church at the same time as the IRA raid on Meenglas Post Office April 1921(which is mentioned) . Finally, there are folk-myths perpetuated when the author deals with the war in general. One example - the brutal Black and Tans were not all "ex-soldiers and unemployed workers from England". A significant number of them were Irish !
You do get the impression that the author is quite partisan rather than balanced in his approach at times.