How to capture artillery?

I autoresolved a battle against a rebellion and got a shiny new mortar. After several manual tries on the same battle, I have been unable to actually capture any artillery myself.

How does that work? What do you have to do?

Solution 1:

My understanding is as follows -

• The army you are fighting against must be of the same faction
• The artillery crew must be wiped out and there artillery pieces intact
• You must have a spare unit slot at the end of the battle

Many people have stated that there is an element of randomness too. Some have quoted roughly a 10% chance to capture and this is decided before the battle so replaying the same battle over and over will likely end in the same result.