think i have found a bug in game
cant assign minutemen to artillery in the castle have built 5 cannons on the top of the walls and if i go up to one i hear i need to assign some one to it if i go up to any minutemen it only gives me the option to trade with them

Stay in building mode and then approach one of them, it should then give you the choice to command them, then go to the cannon and it will give option to assign them to it.

cheers lostpony most greatfull