Before attacking in Grepolis, estimate the target’s defence, travel time, possible loot and your own exposure. Land troops can raid cities on their island; attacks to other islands require transport ships.
Use current intelligence
Check reports, wall level and visible movements. A report can become outdated, so avoid treating it as certainty. Compare the weapon types in your army with the defender’s values and run the Agora simulator.
Coordinate the operation
For cross-island action, synchronize ships and land troops. Keep enough defence at home and agree timing with your alliance. A raid is not the same as taking a city; conquest has separate requirements.
Read the battle guide, naval guide and conquest guide.