It might seem like those knights are destroying your pack of spears – and they probably are – but those knights are expensive. One thing that hasn’t changed is the cost of the unit is still a big factor. That’s where crossbows come in, which are made for armoured units like men-at-arms and knights. That’s because they’re actually using their shields now, and if you upgrade their armour further, normal archers might need in excess of 30 shots to kill one.