The army is massive. It is about 3,000 strong, primarily spearmen, but also with archers, and clerics wielding the traditional greatsword. There are about 5,000 hobgoblin zombies (the Glorious Empire breeds hobgoblins for this purpose) and the commander you recognize as one of the Thirteen, the Chosen of the One. In short: IF YOU ATTACK THIS ENTIRE ARMY, YOU WILL LOSE. The commander is in the middle of the army, protected by well-trained clerics in their god's full favor, and there is nothing worth defending at camp. Your training covered this situation: if the camp is attacked, scatter and go to ground. There are no civilians, and the camp structures are currently on fire. It's only a matter of time...
The jungle is pretty thick, and you could escape there, but it is also filled with bandits, bizarre monsters, or bandits who happen to be bizzare monsters, however, most will not attack an armed party of adventurers. A river is 3 days off, so a raft escape is possible. The main body of the resistance is falling back, they can't hold this.