After a 37 year career in the Army Brigadier Ben Barry became one of the UK’s most respected land warfare researchers and analysts.

Now he’s drawn together his experiences in and out of uniform to write a new history of the British Army over the last half century.

It tells the stories not just of the major operations and battles but also big exercises, and plans which came to nothing.

He tells Kate Gerbeau how it helped him join the dots to understand not only the successes and failures of given moments, but to see the whole arc and how that could help the Army rise again to face the next 50 years.