I'm on my phone but I must say this makes my heart happy.

You might try Alan Mason Ward's "Marcus Crassus and the Late Roman Republic" as a good start. Maybe Plutarch's Lives as well.

I hope these help.

Source: I've written a biography on Crassus.

Also, while you shouldn't ever cite Wikipedia, their references can sometimes be helpful and a jumping off point.

The fact that in death Crassus lost the standards of his legion to the Parthians had serious political ramifications. Recovering the standards was a major foreign policy point and when Augustus wasable to have them returned it was a major motif he used in propaganda.

For example,you can see the return represented on this coin: http://www.southwestern.edu/departments/classics/images/zanker145.jpg as well as several others on that site.

The return is also depicted as the central image on Augustus's breastplate in the famous Prima Porta statue. So, basically Crassus's death was a political debacle that had to be recovered.