Iustus
King
You cannot tell what the longbowmen are meant to be doing just by looking at their upgrades. You need to be using chipotle mode (or go into worldbuilder and check each unit individually with edit unit). What you are looking for is the unit's "UnitAI".
The main unit AI used for defending cities is "UNITAI_CITY_DEFENSE", or "city defense" in shorthand. Most display areas under chipotle will display the full unit AI name, but I shortened the names some in the ctrl-key hover over stacks display, so that it would fit all on one line.
This spoiler shows all the UnitAIs (and the shorthand I used for the ctrl hover case).
Spoiler :
The UnitAI for a unit is the single most important thing to determining what actions the unit will take. With a few exceptions, once built, a unit never changes its unit ai. So a warrior built with an AI of explorer, will always remain an explorer, always doing exploring actions. Now, a warrior built with a unit ai of attack (the default for a warrior), may also perform exploring actions, when it has nothing better to do, but it is still primarily an attack unit. Each unit ai has its own set of orders of what to do.
For example, a city defense unit does this:
Spoiler :
while a city attack unit does this
Spoiler :
Each UnitAI has its own list of actions it attempts. Once it is succesful finding something to do, it does not check lower down on the list.
Note, it is entirely possible to have, say, two longbows, both with city defense promotions, but one with a UnitAI of City Defense, and a second with a UnitAI of City Attack. These UnitAIs will determine the course of action those units take, more than anything else.
This is why I display the UnitAI under chipotle when you ctrl hover over a group. It is the UnitAI of the group leader that determines what the whole group will do (for the most part). An example of an exception of this, is when a city attack group captures a city, then it splits all the units off of its group which do not have the city attack AI. Note however, that its entirely possible that those units will immediately decide to rejoin the group, that is acceptible, but they are first given the chance to decide to defend a city.
It is groups, not individual units, that are counted to determine how many defenders a city has. This is why city defenders are never grouped when they are on city defense.
As far as when the build will be posted, the answer is when it is ready. I know that is not what you want to hear, but that is the best answer I can give you. No point in posting the build until that fix is in.
-Iustus
er, not a 
er. In the last couple builds, protecting yourself in a war has felt like playing chess with a thousand pieces to keep track of. And there's no chance at all of launching one of those surprise attacks I occasionally enjoy. Even if I throw all my best units at a single weak city, I'll be crushed.
