Triggering missile silo

[yemen]

6 howitzers and 32 infantry will not trigger it. 1 more plane is safe. Two planes and it opens. Add 4 and it fires. So it isn't just troop space, there is a hitpoint calculator in there somewhere.
Edited to add: That is 32 ranged infantry. Melee infantry have more hitpoints, I haven't tested that.

 

[Bad Chicken]

Yes it fires using 3 tank destoryers and a general. This combo is used for ww to draw fire from the silo so field howies have a chance to do their job without being hassled, at least from the silo

 

[McGregor]

That's good info. Thank you.

 

[Festivus]

I'm pretty sure it isn't troop count. If it was it wouldn't activate and target when only 3 TDs and generals are on the field.

It's some fixed amount of HP.