“But what if we didn’t need to actually hit anyone, just made it look like the arrows came from the opposite sides?”

Ceo asks, a goblin arrow suddenly in his hand.

Quote from nschrock >>

“You’ll need goblin arrows for that to work.” 

"If it goes the way I hope, they'll supply the arrows" Grim says

Quote from Fitz_Coulson >>

“But what if we didn’t need to actually hit anyone, just made it look like the arrows came from the opposite sides?”

Ceo asks, a goblin arrow suddenly in his hand.

 “Now where did you get that? An illusion? Not sure I’d want to be that close.”

“We wouldn’t have to be too close, just enough to make it seem like they came from each other. Petcan, can you do anything like this?”

The 2 goblin hordes will meet before they reach the bridge. You can see some siege weapons among the goblin horde to the South. They are probably planning on crossing here and will be delayed even further if they have to seek another way across. The goblin horde to the South also looks roughly twice the size of the one from Garrum.

“Not really. I can make one guy we’re pretty close to see an arrow. I can even make it hurt. But it’s so close, I couldn’t NOT be discovered.”

"Randall, if you're going to wait till Goblins are on the bridge before setting it on fire, I'm going to try my idea. If I don't make it here before they do, go ahead. If I'm still alive, I'll find another way across. I'll head away from the bridge an equal distance between the two groups and camouflage myself as best I can. I'll fire arrows at the North group and try to recover as many  arrows as I can that are fired back at me and fire them at the South Horde, then do the same with the arrows they fire at me. I can fire up to 600' with little chance of hitting anything, but in a crowd that big, who knows. The point will be to get them firing at each other. If that starts, or if it looks like it's not going to work, I'll head for the bridge" Grim explains.

Randall:

“That could work, Grim, but it sounds really risky.  Are you sure you want to try it?” says Randall with concern,  “We will have to set the bridge on fire before the first goblins reach the pile of flammable items, or they could just hurl our oil into the river.  While the goblins may be able to swim across, their siege engines are another matter entirely.”

"Why do you want to battle a full army on your own so badly? Do you want to die? Lets just ruin this bridge after the refugees passed and move onwards to protect the refugees from outriders and to talk with the cities army about what we have seen."

Grim smiles "Two full armies actually, which is the only way it can work. Besides, there is a possibility I haven't quite given up on yet."

Ceo asks; ”What if I could get the leader of the bigger horde to fire those siege weapons on the opposite hoard? I have a way with words, and it wouldn’t take much to turn the hordes against each other. I could even try to divide their horde further, turn each against them.”

For reference, Ceo is offering to cast Charm Person to turn the leaders against each other.

Quote from Fitz_Coulson >>

Ceo asks; ”What if I could get the leader of the bigger horde to fire those siege weapons on the opposite hoard? I have a way with words, and it wouldn’t take much to turn the hordes against each other. I could even try to divide their horde further, turn each against them.”

For reference, Ceo is offering to cast Charm Person to turn the leaders against each other.

 "I'm planning on firing at them from about 550' to 600' away. How close will you need to be to convince them?" Grim asks

“These plans sound like last ditch efforts. Hardly Plan A material.”

"Well, timing is an important part of the plan. If it's still dark before the two hordes join up I'll try the plan. If it's daylight, there's no point. So it depends on how fast the Goblins are moving. I'm not suicidal. But if the timing is right, it could delay them substantially as well as reducing their numbers"

"Well, if you really want to go ahead, but better be fast. I'm staying hear helping the rest with burning the bridge; which should slow them down substantially aswell."

With some of the refugees swimming across they will manage to cross that much more quickly and you can begin destroying the bridge.

The more you think about it the more you come to realize that goblin hordes just don't wander about or form naturally, at least not 2 such instances. These are probably both going toward the city of Laurentiis.

And most of you can hazard a guess that any force that has siege engines will not abandon them lightly.

Grim shrugs "Well, I guess we're crossing the bridge and setting fire to it."

Randall:

"I like your idea, Grim, as it would set our enemies upon each other, but it would be a risky ruse to try and pull off with so little preparation.  Perhaps you are right, and we should just cover the retreat of the refugees and burn the bridge behind us.  I will go and check on the status of the incendiary pile at the center of the bridge," Randall says to the eager warrior.

Petcan uses his magic to control flames to dictate how the flames come along behind them. 

Grim, Randall, and Petcan manage to set the bridge ablaze behind you and safely rejoin the refugees as they move away from this side of the river and out of range of retaliation from the stranded goblin horde. From here the best estimates are two days to get to the city of Laurentiis.