The party is 6th level, and there are 6 of them - 1 shaman (think druid), 1 rogue, 1 barbarian, 1 fighter, 1 sorceror/fighter, 1 wizard
In the camp, so far, I have about 15 orcs, 3 orcs with one level of fighter, a half-fiend ogre, and 2 regular ogres. That seems like the party will stomp them. It is at night, but there are enough bonfires to easily see by. The party will probably have time to prepare/enable spells, and are currently unwounded. They do not have mounts and the camp is walled with logs.