Land Grab Calculation

[Ryu]

On my last run I got a 1 acre land grab. Twice, on two different empires. I was using Drive on both empires with 10,000+ land. QMT code had attacks being 0-7%  rng with minimum of 1 acre being taken if successful. So 1/700 possibility of 1 acre.

Was wondering what the formula is for Redwall.

[windhound]

Hm. 
So Drive gives a 1.1x modifier

The land loss calc is:
$loss = mt_rand(1, ceil(($enemy[$building_type] * 0.07 + 2) * $modifier));   

So if the enemy had 10,000 acres all in huts an attack has a chance to take between 1 and 772 acres.  The Drive modifier is applied to the max possible, not the amount taken (...I'd make an argument for it being applied after the calc, but I didn't write it). 
Basically the same as QMT, RNJesus was not on your side.   

[Ryu]

Drive on a 10k empire would have a possibility of being 1-772 acre grab. It simply increases the range of RNG. I understand now.  Much obliged Windy.