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I read fiction if it has a historical base, and hold fairly true to the story, so I did read Cornwell's "The Fort"..
When I went for others by Cornwell..the various Vikings etc, and the Sharp's series..just didn't hit me the same way.
Read through "Alas Babylon' years ago... things that may have worked for himin 1959 (year of puvlication) may not work well today.
"One Second After", by William R Forstchen..would apply better to a current attack/survivalist scene today. It plays out an EMP attack scenario, by a college professor in western North Carolina. .