Jack_of_shadows
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NikitaStoff, for the Knight, Elven Archers are a must-have; you can use them throughout the entire game (on the extreme difficulty level, I specifically forbade hiring them because they are too strong compared to the other archers). Plus, I would advise taking those who can deal significant damage and avoid retaliation – Furies, Dryads, Berserkers. The rest is up to your preference. Overall, you can either use only Knight units throughout the game or completely change the unit composition several times – the gameplay doesn't impose strong limitations on this.