The same thing exactly happened last night, at around eleven the battle starts. You hear distant thuds, it sounds like someone jumping on the floor above you. When i go out i can't see any flashes but the thuds are very numerous like a proper battle, and you can also hear the sound of distant helicopters. it went on until 1am last night. Tonight it has just started 10 minutes ago. I am more than glad I am no where near where that is happening.
You kind of listen carefully for a while wondering whether it will come closer or not. Thankfully it is only the sound of helicopters going by that gets closer.