Strategikon of Maurice(en.wikipedia.org)
en.wikipedia.org
Strategikon of Maurice
https://en.wikipedia.org/wiki/Strategikon_of_Maurice
2 comments
Snippets of Tacticus' advice turns up in various Discworld chronicles, and it can be gathered that he was a very realistic, down-to-earth general. For example, the section of his autobiography entitled "What to Do When One Army Occupies a Well-Fortified Fortress on Superior Ground and the Other Does Not" begins with the sentence "Endeavour to be the one inside."