Fire Emblem: Gods of the Celestial Realm [OOC]

It's kind of unfortunate that you don't have any tanks, or really any actual frontline fighters. Ideally the archer and mage would surround the pegasus to prevent any possible hits from that axe, but that's not all that possible from here.
Going forward, it'd be best to let the ranged attackers start the turn to soften up the enemy, and hope the pegasus knight can land a finishing blow and without tripping a counter-attack.
For now, try to finish off that sword, obviously. The Fire Emblem AI from the GBA games would have the brigand target the archer first, since they love free hits, but I doubt BTM's emulating the FE AI.

Of course, if the no-shows show up, that'd completely turn things around.