[Suicide Junkie]

Not quite. The 30% isn't a to-hit modifier, its a damage modifier.

So your troop with 3 ground cannons @ 20 dmg each will do only 18 damage if it hits.


ECM and Sensors add together, but never go above 99% or below 1%.

I multiplied the damage by the probability of a hit. (Based on ECM/sensors/etc)
In reality, it would be either 18 or zero, but since we're dealing with hundreds of troops, the expected damage is 18 * (probability of hit) * (number of shots)

To expand that:
[total damage per troop] * 0.3 * ( 100%-[ECM]+[CS]+[Net Racial modifier] ) * [number of troops]

With the added caveat that the whole ECM/CS/etc part in the middle is limited to values between 0.01 and 0.99