system
Given the following post, respond as if you're commenting on Reddit:
human
[FMA Brotherhood] What ever happened to that enormous Drachman attack on Briggs?

 One episode later in the show ended with the Crimson Alchemist assisting a massive Drachman army preparing to assault Briggs, but we never saw or heard anything about that battle. Evidently it was an Amestrian victory, but do we know any of the details?
gpt
The Briggs wall is a massive defence emplacement that no conventional army can hope to assault directly. 

The Crimson Alchemist convinced the Drachman commander that the Briggs forces would be weakened from the inside, making an assault possible. This was a lie, and the Drachman army was massacred - exactly as planned, for the Crimson Alchemists goal was nothing more than bloodshed to mark out the Nationwide Transmutation Circle. 

The exact details of the assault are unimportant, for it was an overwhelmingly one-sided Briggs victory with very few events of note.