Hi there, I assume that the problem could also lie in the diplomacy settings (i.e. "Are they really an enemy?"). When setting up the match, make sure that their team number is different from yours (or there can be no team number assigned to both players). If the diplomacy mode is enabled (meaning if it's allowed to change your teams during the game), you can try opening the diplomacy setting (icon somewhere in the top right corner) and check if the AI is set to Enemy and not Neutral.

Hi @Amj, welcome to the forums. Make sure you don't have ceasefire enabled at match setup. Try "attack move", CTRL + right click by default. Also make sure your units are on aggressive stance: If your units still don't attack maybe attach a replay here. HTH

Solution? Be the host, or just play 1v1.

One of the worst things about this game the lack of balanced games, it's totally hard to balance games and every time the host is trying to win games by putting the worst players in the second team everytime i'm on the second team it's almost always a lose, because the host only want to win every single darn time 

Hi There, Thanks for developing a really nice game I just need to report a bug. Almost all the time, whenever my boats or soldiers are commanded to attack enemy soldiers or boats, they do not attack the enemy and do not cause any damage to the enemy. Instead they just go near the enemy and stand there doing nothing. Can you please look into this and fix this.   Kind regards, Amjad 

I found this illustration.   Eastern Roman Centenarius (Kentarchos, ancient centurio) facing a Hun warrior in the 5th century AD. Ilustración de Pavel Glodek.

Wouldn't it be possible to divide the victory condition by teams? Team 1 victory condition vs team 2 victory condition?