thank you everyone for the help provided but i need some hints or tips to save the bridge from the ogres. my party is barbarian level 6,fighter level 5/paladin of the helm level 2,rogue level 5,female cleric level 5

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Just go straight for the bridge in the east and kill every thing right away, don't fall for the woman's talk as she's only trying to stall you to give the ogres more time to destroy the bridge. So cut of the conversation with her or use a high wisdom character to notice her offer is to good to be true for more xp and kill those ogres.

Don't attack the archers, as they just run off into more enimies. You should be able to get rid of the melee enimies or run past them as said in the previous post to get to the bridge fast enough.