Best anti-personnel artillery is ?

[Sir_Hawkwood]

Defending a siege, I think that mortars are the best.
I've got at least 5 in every border settlement, the rest of the garrison being made up of Bill-scum and Chav*-archers...

Never lost a siege due to the power of the mortar battery.

Outside of that, I tow around Culverins and my old, leveled up ballistas.

I agree with Forward Observer, that when leveled up a ballista is a very dangerous weapon, due to its constant accuracy.

Having said that, I wonder how effective my gunpowder artillery would be right now, had I taken the time to build it up rather than improve my ballistas?

* UK modern slang for Peasants, identified by their large sports logos and cheap chunky jewellery...