-- In war, truth is the first casualty.
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"Duchess of Mandalore" wraps up the Mandalorian trilogy of episodes. In some ways, it's a stand alone episode in that the plot is self-contained; however, you really need to have watched the previous two episodes to understand the action in this one.
This episode is interesting to me in that it clearly shows Darth Sidious trying to manipulate a political situation... and failing. It actually reveals where the true front of the war is, and that is not on the battlefield. The Jedi never come to realize this. Well, at least not until it is well past too late, which we see in Revenge of the Sith. Sure, sometimes Palpatine's plans are foiled, but it's never because anyone is trying to foil those actual plans; it's always because someone is standing strong in their belief in what they're doing and the plan just doesn't succeed. It might be a fine distinction, but it's an important one.
Unfortunately, this episode doesn't go any deeper into the relationship between Satine and Obi-Wan. Well, not more than that Obi-Wan is pretty much willing to do anything for her, but you should be able to get that from the previous episode. Fortunately, if I'm remembering correctly, Satine will be back and there will be more development of the Ob-Wan/Satine story.
Death Watch is still wrapped up in the plot of this one, and we get to see Obi-Wan go toe-to-toe with another Mandalorian much in the way he goes up against Jango Fett in Attack of the Clones. It let's us see how these suits of armor they wear were really designed for combat against the Jedi.
Death Watch will be back, too.
As I said, this is a really good series of episodes and one of the ones that I remember best from my previous viewing of the series. It's not a bad place to start if you just want to test the Clone Wars waters.