To remove all doubt, I just did a sandbox to test this (on Alpha 17). Adding ranged or melee infantry makes no difference, you get 1 extra arrow every 2 seconds for each infantry garrisoned in the tower. If you add the "sentries" and "crenelations" tech, plus the maximum of 5 garrisoned infantry gives a maximum of 9 arrows every 2 seconds. However, it seems to me that logically only ranged infantry ought to add arrows. Perhaps a way could be devised to have non-ranged units (possibly including females) be helpful to the effort if they are garrisoned in a tower together with ranged units. I am thinking something along the lines of logistics inside a tower, making sure of a steady supply of arrows. Something like that. Each non-ranged unit might reduce cycle time (the 2 seconds) by 10%? But still with a max of 5 units in the tower of course (the tower is only so big). Regards, Christine