I would like to see the game implement an alert when another player attacks me.

For example, when another player sends an attack to a resource tile that I hold, the game would announce it with an audible sound like a trumpet. Then the tasks pane in the lower right (I play on the PC) would show the attack march, colored in red.

That way, if I'm online, I have time to respond by clicking on the attack march and withdrawing my troops. If I'm offline, then the alert does me no good, of course.

Currently the game does not allow for players to adequately defend themselves.