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They added defensive pacts which means only if your ally gets attacked and military alliances which means if they attack you attack. Non aggressive pacts just mean you won't declare war on each other.
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It lets you focus on your other neighbors first. The AI tends to honor pacts better and the fact you can make non aggressive pacts is a life saver. In Rome II you can save your ass with it. The Diplomacy is much approved and much much better. If it has catapults or battering rams it can actually be a decent fight. The AI sucks with ladders and will usually fail badly with them. As far as when you're defending it really depends on the siege equipment they have. Phase 2 is keep its better units around the capture point / bottlenecks to it. Send fodder units to attack the units going up the walls for phase one. That being said once you get past the walls the AI usually has a 2 part plan. Sometimes an entire wall is covered with melee with I just send my archers to shoot off the wall before I make my melee push the ladders. It will put units up on the walls but it doesn't check what type. Other things to note is while the AI is improved it isn't much better at defending forts than Shogun II's AI. So you won't kill them with anything but other ranged in open field battles. They shoot while kiting your units and are often the fastest unit. When the general is inside a unit of 160 melee I find it tends to be more aggressive. That latter doesn't happen as often and as for as I can tell it depends on the AI's general type. Usually being pelted by all the ranged units before meeting its demise on spears. Sometimes it uses it correctly and keeps it in the rear safe, other times it leads the charge straight into its death against my front line. That being said the general can often be dumb. So in other words they try to make some units go around your flanks and it sends spear men after your horses and it makes its archers retreat if you send units after them. The AI is a bit smarter and actually tries to flank and send the right type of units after your wrong type of units. Rome II is currently comparable to Shogun II as far as the real time battles go.
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I've spent a good deal of time in the game but mostly only single player and custom battles with friends. So if you any specific questions I can try to answer them.