Age One Town Breaches

[Yakabis]

To escape it is much more rp to jump over the top of a wall even though breaking is fine too, but to enter, a lot of people say it's ok to build a tower. But is it also ok to simply build a tower over a wall, raid the city, then leave all whilst no one in the city is even online? Shouldn't there have to be at least one other person on to defend it. Since in real life one cannot logoff...Sadly