coordinated attacks

Would more experienced combatants please advise whether we can coordinate our attacks on a single city. What happens if , say, Necrotaur attacked a city and then I attacked it also 30 secs later?

I have begun setting up satellite cities far from my prime city in hopes of being within striking range of identified FFA targets and of being close enough to United members to be able to lend speedy reinforcement if needed.

If we can coordinate attacks on a target I'd like to participate. If someone would orgaize an attack by anouncing the target coords and the date and time we want forces to arrive on target I'd try my best to be able to dispatch my army so it arrives at the desired time.

tree