Extra armies for territories
From Warzone Wiki
WarLight can be configured to give extra armies based on the number of territories that players control.
For example, if this setting is set to 3, players will receive one extra army per turn (income) for every 3 territories they control.
These extra armies apply only after the base armies per turn has been reached. In other words, players will receive whichever is larger: the base armies per turn or the extra armies per territories - not both.