Next to each of your raid targets there is a small black heart 
icon that you can change by clicking on it.Each time you click it changes. 8 clicks will return it to the original icon:
As well as the black heart icon
there are 7 others to choose from.
You can use these to flag the properties you have successfully raided.
Different strategies can be applied. One example that could be used is:
= Identified Target
= Unsuccessful Raid
= Successful Raid
This will help you to remember which properties are inactive and should be retargeted each day while raiding.
With the introduction of civilians these icons can be used to automate you raiding process.