[Rules] Combined fire

[casey69]

Question concerning a leaders combat value..in reading the rules,might I assume that a combat value of 1 would allow the leader to combine the fire in 1 adjacent hex....a value of 2 ..the firepower of 2 adjacent hexes....and a 0 combat modifier ,only that hex can fire..? I also realize that the combat bonus can also be added to the fire power of the units in the hexes..
Thanks