I had also noticed something, but was not sure if it was true or not, and I just drew the connection.. I had a friend playing the Louix XIV and there was Catherine between us, and they were both getting pounded harshly by the barbarians.. both being creative had higher scores than myself, who was virtually left alone..
as a side note, the sentry of units to reveal all areas, and eliminated fog of war around your flanks is a very useful method, as some have mentioned.. I will always try to have clear flanks in all directions, and a united offensive towards the area that is beyond where I am likely to expand immediately to face oncoming barbarians