Do having a good diplomat (or spy, I'm not sure of which) travel with the army reduce the chance of army will rebel/deflect (bribed)?

It seems to help a bit for me. So, whenever I have to walk an army some where, I always have 1 dip (2+ infl), 1 spy and may be an assassin going with them. If the army is led by a general, I might add a priest (2+ piety).