Mines 6

Erm. . . I don't know as much about air and artillery scattered 
minefields, but this is my estimate.

Artillery:  Standard blast radius as per normal artillery.  Open sheaf 
gives 50% probability encounter, 2 chits, validity as per conventional 
mines.	Tight sheaf gives 40% + (10%xguns firing).

Air-delivered:	DFO may be scatterable mines, as per artillery.  60% 
chance of encounter, otherwise all the same.

Note that most scatterable mines have a self-destruct fuze, with 
variable settings from 18 hours to 7 days.

John M. Atkinson