Originally Posted by Slider6977
No its not a bug. The TW engine, as it stands now, only allows for two weapon types to be used by a single unit. For infantry units such as Roman hastati, principes and similiar units, their first weapon is their pilum, and the second would be either a sword, spear, etc. The engine simply does not allow more than this. So for phalanx units, it is different, their have their spear for when in formation, and a sword for when on walls or out of formation.
So they can only use two types of weapons. Principes throw their pilum and then only have their spears. It would be cool if you could have three or more weapons. Some units historically had a bow, a mace, a sword, a lance, etc., all equiped for battle. I would personally like to see this, if only for the reason you brought up - that principes and similar units that use spears, but also have swords, could use both when the right situation calls for it. But it is simply not possible.