RS 3.1 - Rome 1 Turn: Is there an attrition model?

[MeiguoJinjang]

I was unaware of any attrition model other than specifically unrest and plague.

I just had two stacks in the North African desert reduced by 50% facing a probe by a Greek army which is very light. (almost as if the same thing happened to it)

Thanks.

PS: If there is an attrition model, does anyone know how it works?

[ur-Lord Tedric]

There are certainly: 'Storms'; 'Earthquakes' (sounds like yours); & 'Eruptions'. They can be pretty dramatic.

Sadly not all of them show up as 'Events'.