I have just watched a documentary about the Welsh Revolt of 1400 where the people of Wales engaged in guerrilla warfare against English rule. I have been brainstorming on what kind of military tactics the main character for my fantasy series would utilize. Now, after watching the documentary and learning about how the Welsh resisted the English, I was thinking of having my protagonist plant sleeper agents throughout his rival’s territory in order to spark rebellions among the populace. This will cause the rival kingdom’s integrity and infrastructure to gradually weaken. When enough time passes and his rival’s regime becomes vulnerable from internal attack, the main character will unleash the bulk of his army against his foe and officially begin his conquest.