i had a 5 star general besieging a settlement. next turn i brought up a small reinforcements under a captain (no stars) and i placed them next to, but not into my general's stack. that turn the besieged sally forth and attack my captain with his much smaller relief force. thats fine with me, since i put them there, but in the ensuing battle, i had to use my small captain force to play obstruction to the much bigger besieging force because my 5 star general (AI controlled) is charging on horseback way ahead of his reinforcing troops. its the old suicidal daimyos problem from shogun. i would much rather have had my captain's force get obliterated with no reinforcements, than have my 5 star coming to my aid by getting skewered.