Let me set the scenario.
I'm playing Lannister, GJ is open to an early alliance. I accept.
Other players are also diplomatically friendly towards me, I accept their alliances in the hopes of slowly building my power before picking a target/fighting the one who strikes me.
Turn 6, I hit a block. I've got all normal Lanni territories, but I'm also hitting supply limits. If I want to muster more armies, I need to take more territories.
Here, I blunder away any advantage.
I pick Martell at the Reach as my target, bc I'm taking a castle away from the leader.
Surely Mar's not crazy enough to Doran me and give the sword to his arch-nemesis Tyrell. Surely Stark is keeping GJ busy enough that he won't turn on me.
Mar Doraned me, GJ betrayed me, Tyrell took back the reach.
tl;dr I got obliterated.
I understand now that it was a bad play and why it was a bad play.
I don't understand
(a) If my assessment of the situation was accurate and
(b) What would have been the optimal strategy?
For Reference:
https://game.thronemaster.net/?review=1&game=94474