same thing when i was still building my level 1 fortress "
realm first day opened and first day after registered"
but soon it is pretty easy actually... i just figured this out when i start using this forum
1) check your flag
2) calculate your distance using codegrll site ( to check how much time will the troops to travel )
3) check your battle history if what time are you usually on and check what time enemy did a successful attack on you,
4) use calculator to check your resources if its worth the attack...