Need a cunning plan milord.

[Skaven]

Removed for secrecy!

[Eldan]

Anything to help a fellow Skaven (hihi, gullible sod-sod)

Do you have torches, candles or any other way of making a fire?

If you do: bind a weight at one end of a rope, throw the rope over a high and sturdy branch, tie the other end around a tree. Light a small fire under the rope. Hopefully, the rope will burn through in a few minutes, making a lot of noise.

[Ranielle]

You need a plan that's so cunning you can brush your teeth with it.

[Mastikator]

If by "cunning" you mean "so stupid it might just kill everyone in the party work", then have the fastest character stand in line of sight of the orcs, in broad daylight, and yell "Catch me if you can!".

The orcs are armored, therefore slower, and won't be able to catch up with your fastest character.
The orcs are also dumb, unwise and ugly, it wouldn't be too unlikely that they'd ALL go after the bait, leaving the entrance open, and making an opening so that the rest can sneak in. Once in and hidden the bait will have shaked the orcs, which then return back to duty thinking nothing of it.

On the other hand, the bait might die. And you'd be unable to flee from whereever it is you're trying to sneak into in case things go wrong.

[Dr.Epic]

Are you guys good archers? Grab some bows and try to attack 300 ft away. It'll give you a few rounds while they can only approach you and possibly do a few sets of d8 damage. You could also try negotiating with them or trying to scar them off.

[Coidzor]

Deadfalls, pit traps, and ambushes if you can actually get the orcs to go towards a location.

In the vein of scaring them off... if one of you has a good bluff check you could rig up a small army of "treants" and bluff your way into getting them into leaving from the threat of an army of the trees/druids.

Alternatively, gift them some contaminated meat(poison or disease as available). How you deliver the gift is up to you... You could, for instance, do a different druid bluff where you accuse them of poaching it and just leaving it there and demand they eat it in order to keep the cycle of nature going.

[kestrel404]

Build a crude wheelbarrow out of green wood (living branches freshly cut). Fill it with a mixture of leaves, rotten/mushroom covered wood and dry/aged wood. Light the dry wood on fire - it should burn nicely. Let the whole thing really get going fairly well until you've got a portable bonfire - at this point, it will be pouring out smoke like nobody's business (leaves and rotten wood both produce more smoke than fire). Wheel this into the mouth of the cave - just charge in and tip it over so the fire spills out right into the path the orcs would have to take to reach you. Add lamp oil if you've got it. Fight at the mouth of the cave, preventing the orcs from getting out.

The huge volumes of smoke will prevent the orcs from shooting at you with ranged weapons (except blindly). The smoke in the cave entrance will fill the interior of the cave, weakening the orcs inside and probably suffocating some of them. The fire will damage them on the way out, and if you can manage it you can force them to fight on/over the fire itself.

Basically, with the orcs in a defensible position and you on the attack, you are in a siege situation - they've got all the resources and are a tough nut to crack. By putting the fire into the cave mouth, you're depriving them of one of their most important resources (air), and by holding the cave entrance against them you're reversing the siege situation to be in your favor.

[TalonDemonKing]

Orcs are heavy. More so in armor.

Dig a large pit (15ft deep by 10ft wide and 10ft long). Cover it 'lightly' with wood, then cover that with leaves and other natural surrounding stuffs. Have a character (The lighter, the better) strip off their armor and walk across the planks to test for weight. If they can get across without breaking it, solid. If not, rebuild and retry.

Have the bait taunt the orcs. I'd recommend making faces, calling them names, tweaking nipples, whatever to aggrivate them, then haul ass towards the pit. A crossbow or any sort of range attack to keep them glued onto you would be win.

Because orcs have heavy armor on, they should be slower than your bait. Have him run across the pit, then have the orcs follow. Being heavier, they should fall in.

From there, set fire to them, pepper them with arrows, or just leave em. If not all the orcs follow, repeat process.

[thorgrim29]

If you've got a few casters who speak orc, you can probably use cantrips and illusion spells to make them fight eachother

[Chilingsworth]

If you've got a few casters who speak orc, you can probably use cantrips and illusion spells to make them fight eachother

Sadly, the OP said they've got no magic.

OP, how many characters are in your party, and what are their classes?

[Skaven]

Removed for secrecy!

[Fitz10019]

the local forest elves

Can you buy, barter or steal some alcohol from the elves? Set up camp, roast some deer upwind of the orcs. When they investigate, run away. If they think it's their idea to raid your banquet/camp, maybe they won't be suspicious that you were luring them away from the cave entrance.

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Dang, I was soooo hoping this thread was announcing BlackAdder the RPG.