The Mandalorians are pissed.
The Rebels forsaken.
The Imperials betrayed.
This is how things started off and went down hill from there. The Mandalorians agreed to help the group if they rammed their Star Destroyer into the Imperials. They tried but unfortunately were taken out before the ship made it there.
The Rebels have been ignoring the group in the mean time to help fight off the Imperials with the Mandalorians.
Unfortunately for everyone involved the Star Destroyers of the Imperials are not going to be taken down easily.