In several games (monarch level) I saw the AI commit the following stupidity:
I place a weak decoy unit (or weak stack) in a place that is inside enemy territory but inaccessible to enemy units in one turn (because the roads/railroads were pillaged by bombardment. The enemy would take huge stacks out of his cities even cities I currently besiege and even if this weakens his capital defences. The enemy will move them recklessly past my armies, get ZOC damage from them, to defeat the decoy force at all cost. The decoy I use is usually outdated offensive units but this works with defenseless bombard units and workers as well. The best case was when he took out 10 units from his capital-rifelemen and cavalry ( there were 14 units inside) without bothering to look on the 35 cavalry and 3 rifrlemen stack plkaced one tile from the capital. Does that behavior universal?
In addition after the decoy was destroyed or disengaged back to it's transport ship the huge enemy stacks got fortified where they were and remained there without being used for long span of turnes while his cities got razed/captured one by one.
The strategy worked if the decoy is lower on defence and the invasion stack is protected by a defensive army. I used that in unmodded c3c and in LOTM modpack.
I place a weak decoy unit (or weak stack) in a place that is inside enemy territory but inaccessible to enemy units in one turn (because the roads/railroads were pillaged by bombardment. The enemy would take huge stacks out of his cities even cities I currently besiege and even if this weakens his capital defences. The enemy will move them recklessly past my armies, get ZOC damage from them, to defeat the decoy force at all cost. The decoy I use is usually outdated offensive units but this works with defenseless bombard units and workers as well. The best case was when he took out 10 units from his capital-rifelemen and cavalry ( there were 14 units inside) without bothering to look on the 35 cavalry and 3 rifrlemen stack plkaced one tile from the capital. Does that behavior universal?
In addition after the decoy was destroyed or disengaged back to it's transport ship the huge enemy stacks got fortified where they were and remained there without being used for long span of turnes while his cities got razed/captured one by one.
The strategy worked if the decoy is lower on defence and the invasion stack is protected by a defensive army. I used that in unmodded c3c and in LOTM modpack.