Okay, I've been hunting around the internet for about 20 minutes now, looking for information on the Allied Supply Crates that have appeared in my camp after getting envoys from the races I've got to join my army. I know donating gold to the knights, etc. gives me exp, but does it actually improve their armour or something during the battles? I don't really wanna waste all my money and runes for some exp. Can someone shed light on this?
It's only for giving XP. There is no indication it has affected the game in any other way. I was curious about this as well and did a search and i've found no information that it was anything besides an alternative XP route if you have excess goods.