Taken from Twitter thread: https://xcancel.com/TimONeill007/status/1945638809691197825

The Great Captains by Henry Treece The Crusades by Henry Treece

Thread for advanced 7 year olds:

Joan Aiken, The Wolves of Willoughby Chase Lloyd Alexander, The Book of Three (and the rest of the series) B. B. The Little Grey Men James Baldwin, The Story of Roland Michael Bond, A Bear Called Paddington (and sequels)
Arthur Ransome, Swallows & Amazons (and sequels) Margery Sharp, The Rescuers (and sequels)

Also to look at:

Alan Garner ? Susan Cooper, Ursula le Guin, Anthony Buckeridge, Rosemary Sutcliffe Katherine Rundell Henry Treece’s Viking trilogy Hornblower His Dark Materials by Pullman

Authors of Boy’s novels

Rosemary Sutcliffe Henry Treece (Viking series) Jack London Kevin Crossley-Holland Geoffrey Trease Leon Garfield John Bellairs John Christopher Frank Bonham Manly Wade Wellman’s “John the Balladeer” stories Louis L’Amour ( ‘The Walking Drum’, ‘Fair Blows the Wind’) Luke Short Geza Gardonyi’s “Slave of the Huns” Hardy Boys Project Hail Mary by Andy Arthur Conan Doyle Eagle of the Ninth Rangers Apprentice Ronald Welch’s The Gauntlet
Cherub series Alex Rider Michael Morpugo Enid Blyton?

https://en.wikipedia.org/wiki/Eagles_of_the_Empire

Alex Rider: 10 Explosive Missions by Anthony Horowitz Hal & Roger Hunt Adventures Book