You cannot just send one attack. You must send waves.
: From level 10+, successful raids have a chance to drop Sea Chart pieces . Collecting six pieces reveals a "Barbarian Fleet" on the map, which can be looted for massive rewards without needing merchant ships. Strategic Tips ikariam barbarian village attack guide
By mastering the art of Barbarian Village attacks, you'll become a formidable player in the world of Ikariam. Happy gaming! You cannot just send one attack