[Suggestion] [Spoilers] Dragonfall

The Bridge Build/Defence achievement requires 25 defences or builds. Understanding that Build events are tied to the start of meta, it would be nice to have the frequency of the Defence events increased just a little. 25 Defences is really not a huge number, but there is also a lengthy delay in between defence events -- especially when numerous escorts pass over the bridges. I just think, this would be a good time to initiate a defence.