Large enemy armies after taking a castle just walk away

[Blokies]

I honestly find it really weird, that when you are sieging and you see a large army coming, if you start the siege you are 100% safe. The ai cannot join the siege to defend or attack you in your back. And after taking the castle they often just walk away, while this would be the prime time to attack. In my opinion this makes no sense and the least they could do is that when the ai has a 1000 units army and you just took a castle with 300, they should at least siege the castle so you are stuck instead of just walking away and giving it away for free. Makes it kinda easy, but takes the fun out of it a bit, because this makes sieging even more easy than it already is

 

[veronicaaltoids]

I think because the computer logic is
IF found castle siege, form army to rescue,
if castle no longer under seiged , find a new target

so in this case, the castle already taken, so the army will auto trigger to find a new target, not follow the original target castle anymore