Start 1 battle between 1 of your own and 1 of your opponent’s fleets. The fleets have to be in the same system in order to engage and If there’s more than 1 other fleet in the system you’ll have to announce who you will battle.
When you have an alliance with another empire, you gain several benefits.You and your ally does no longer treat each others units as “opposing fleets/forces”.
Is this means that Battles aren’t automatic? ie, if one player fleet entrance to the system where is fleet of another player (assuming that there is no alliance between them) does not automatically lead to a fight? One of them must choose action Battle?