combat tactics -scouts

Scouts...amongst the weakest of the damage/defence bases and left to do their scout missions rather than real combat. Sayin' that, scout missions can often enough lead to scout wars. Defendin' cities scouts (with open gates, ofc) will take the initiative and attack enemy scouts invadin' them, in an attempt to prevent them returnin' a report. Luckily for the attackers, no other units are involved in this so it includes only the two armies of scouts and acts as a Valley fight (no walls or defences included). This is probably the most basic kind of battle as it only involves one unit and at a time when techs are all maxed comes pretty much down to numbers. Maxin' out the attack wave might be enough, but in a city where there's say...200k scouts, expect to have to send more than one wave. If there's over a million scouts you might not even get the report back based on the 10% rule and have to send several more waves before you can even find out how many they have. Only hope that they don't start sendin' them to you in an attempt to wittle your numbers, too.
Note that if you are scouted and the enemy kills 10% or more of your scouts but still loses the battle, that they will only get the report of the scout battle and not anythn' else from your city. The only way for them to get a report is to kill all your scouts or if you have no defendin' scouts when they arrive or if your gates are closed.