Hm... A mechanic that makes orders arrive delayed and not entirely accurate would be anti-fun. But definitely historically accurate.

A subreddit for the Total War strategy game series, made by Creative Assembly. Discussions, strategies, stories, crude cave-drawings, and more for Medieval 2, Empire, Shogun 2, Rome 2, Attila, Thrones of Britannia, Warhammer, Three Kingdoms, Troy, Pharaoh and others.