GameBanshee Forums

You can find some walkthroughs, hints & tips, as well as cheats at: http://dsiege.rpg-guide.com/

Try setting your party to Ranged weapons and Hold position (you don't want your party exit off the platform), activate the lever to cross over, and if/when you are almost wiped out, activate the lever again to retreat back to the original side. Heal/ressurect your party... repeat as neccessary!