It’s not immediately obvious, but the silhouette on the dust jacket — soldiers advancing in single file, on foot (‘boots on the ground’) isn’t one squad, but five soldiers from different campaigns.

From left to right, first comes the British infantryman of the second world war; next is a ‘jock’ from (I think) the Korean war; then a jungle fighter from the Malayan Emergency or the Borneo ‘Confrontation’; then, unmistakably, the long-suffering foot soldier of Operation Banner, the 38-year counter-insurgency (or police action, no one ever quite knew which) in Northern Ireland; and finally, the technology-festooned warrior of Iraq and Afghanistan....