that depends. i have a lvl 14 town hall with level 14 defenses. i need to calculate how much troops they send out so my inferno towers dont get overun by barbarians while pekkas shred my defenses. i have 1o pekkas defending the base with all max level heros. if they have 5000 troops i might survive because i have a ton of mortors. during the attack i can also try and fight in clan wars.
*Sirens would sound, but it was already too late as your nuclear missile hit the city with everyone dying in the flash along with the enemy king surrendering after*