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[gollum]

Try using arquebusiers behind your arbalest/crossbow line, and use them to give extra punch in the volley. You can coordinate volleys by putting all missiles out of fire at will and then either click to an enemy unit for them to fire or just enable fire at will so they fire all at the same time. Its devastating.

edit: one more advantage of the coordinated volley is that you can use more effectively your ammo, as you can prevent units from firing when there are less chances to do damage or run at out of ammo due to firing all the time and hence remain without missiles for many more attackng waves from the enemy. This is particularly important with the horde.

Handgunners are a unit used best to melee and its shot can aid that. They aren't fit for missle duels.