Have more armies at the same time
Why: more deployable armies = more waves and more fronts at once (up to 5).
What helps directly
Upgrades
Unlock one more army slot
In Upgrades, raise "Army Expansion": you can deploy one more army (up to 5).
WhereStronghold › War Tactics
Related bonuses (good to know)
Tactic
Reinforce an ally without using your own slots
Sending reinforcements to garrison at an ally's doesn't consume one of your attack slots.
WhereAlliance
Keywords
Other needs · Grow my armies