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With a number of trainable creatures equal to 20, it seems more reasonable to retrain monks into knights, in my opinion. Relying too much on ranged units is too risky, as they have relatively low initiative, and a skilled player can easily take them out of action. Even with a small income, you can start retraining spearmen into monks from week 4, and when the income increases, you can switch them to knights. With this approach, in a couple of months, you can get a stack of knights that is 2-3 times larger than your opponent's, and if you divide them into 2 squads, playing as Axel or Miev, you can destroy half of the enemy army in the first minute of the battle.