How do I beat Scorched sand?

If you use Eirika, justwork your way down towards the lower left corner. Make sure to keep Innes in back so he can take care of pegasus knights and the like. Then when you meet up with Ephriam, kill everything in the area and wait for the small army to of Grado to appear behind you. Beat them and start sending your magic users like Artur and Lute (which should be high levels, right?) and kill of the one guy with the ax. Use archers to kill Valter though. Thats how I beat it anyway. And don't forget to stop by that village by Ephraim's army. You get a master seal there.

If you use Eirika, justwork your way down towards the lower left corner. Make sure to keep Innes in back so he can take care of pegasus knights and the like. Then when you meet up with Ephriam, kill everything in the area and wait for the small army to of Grado to appear behind you. Beat them and start sending your magic users like Artur and Lute (which should be high levels, right?) and kill of the one guy with the ax. Use archers to kill Valter though. Thats how I beat it anyway. And don't forget to stop by that village by Ephraim's army. You get a master seal there.

Bring in your flying units and your magic units, the sands won't affect them. The best way to do this chapter is to bring the three units you get (what units you get will depend on the person you took as the lead) when your army is whole take out vaulter's solders out first taking out the flying pegususs knights of the enemy with your own and cormag (if you're playing Ephriam's quest) since magic (Luna exempt) won't do much. After the wyvern solders are gone the enemy numbers should be sorry by now, take out the rest of the solders (I recommend leaving the boss units alone for now) now that the strongest solders don't have any more protection take em' out (If you fight callech with Jashua they'll show how they know each other)