You can pick up a battle with another village as soon as you have your barracks and one troop ready but it’s better to do so when you’ve at least one bison as well so you can loot resources from the enemy in case your raid is successful.
To start a battle click on the Battle tab in which you’ll see the following:
To start a battle you’ll need to assemble your army using the sliders to determine which types of troops and quantity of you want to use for the attack. You'll be able to see the ATK (also referred as DMG in some pages), DEF, and HP stats of your army plus the total cargo capacity your army can carry.
When targeting an enemy village you’ll be presented the following screen:
In this screen you'll be able to see the amount of resources the enemy village has, the amount of resources you'll be able to loot, and a simulation of the outcome of the battle.
The 👤 icon shows the amount of troops your army and the enemies army have, and the 💀 icon shows the percentage of troops you will lose and the troops the enemy village will lose.
Once done you need to select a target from your list, click on attack (which will represent a cost in Crystal, more on this later) and confirm it within 5s for it to be carried on. The outcome of your attacks, and your defenses, can be seen by clicking on battle history. You’ll have to wait 10m in between attacks
Everytime you move troops through the portal there is an associated cost in Crystal (you can lower it by leveling up your portal to get to a maximum 40% bonus).
If an attack is successful, up to 50% of the resources on the target village may be taken by the attacking army as loot. You won't be able to attack another users village if their shield is up, and they won't be able to attack you either if your's i up but keep in mind that shields have a determined duration and a long cooldown.
Another thing to consider is that when you select a target what you’re seeing is a snapshot of that target’s army, and resources that may change from the time you select the attack to the moment you carry on with it so it’s a good practice to always refresh the target list before launching an attack to make sure the outcome will be what you expect.
It's smart to keep this in mind when selecting a target since the costs of moving the troops + the cost of the troops lost in combat vs. the resources to be looted might make the attack a bad idea. Unless you’re after that village then no expense should be spared to smash that quarrel.