What's the best tactic to attack and successfully exterminate an entire village inhabited by nothing but skilled orc...

Thermonuclear orbital bombardment.

Line infantry?

Bombards and longbow men firing over pike men and supported by dismounted knights/other heavy infantry.

EXTERMINATUS

Zeppelins.

>Poison the water supply?
I like your style!

>They're not farmers

This is a very common misconception.

Orcs are farmers, they just don't grow the labor intensive, wide, massive, fields of grains we see and associate with successful agriculture such as: corn, wheat, barely, rice, chickpeas, etc..

Orcs invest their time in high-caloric, low maintenance, plant it and forget it crops like potatoes, squashes, pumpkins, onions, garlic, rhubarb, blackberries, with the closest thing to a grain being beans.

They're also crazy 'bout pigs.
Orcs LOVE raising pigs. I wouldn't be surprised if Orcs were the first to domesticate pigs.

flood the area
if near mountain call Mr Avalance and run
change weather spells to perma-rain killin all the foods
locusts. loads of locusts
plant poisonous weeds
summon Gra'tha'xlas major demon from the 3th circle of hell. He will find a way
something like permanent darkness spells
salt the fields at night
put sign "Employment opportunity: Mercenary guild hires competent fighters" and give direction to the middle of some desert.
Create internal strife by dropping easy to read feminist literature all over the place for the women to pick up
dig tunnel to underdark, paint sign "pick slaves here" showing the direction
spread magical gold coins that vanish in the night. everyone will assume some other orc stole them
Ask them which weapon (sword,spear etc) s superior and let them demonstrate it. Hope they sperg out like Veeky Forums over it.
Only you can enable forest fires
introduce them to alcohol. it solves a lot of problems

Hire a party of adventurers.

This.

Or hire the hobgoblin mercenaries, that way you solve two problems at once.

Divert a river
Burn the place down
Poison the water supply

priest sorc + archmage water elemental ruins orc grunts pretty hardcore

This entire orc village must be purged.

1) Throw In a few elves
2) Wait for 48 hours
3) Slaughter all orcs who are exhausted after 48-hour rapefest.

Call for negotiations, gift them barrels of wine as a "sign of goodwill" and then poison the wine with a slow acting poison. Attack the day after their feast, around early moring, when they will be drunk, sloggy and puking their own shit out.

Glad you could make it, Uther.

Simple, diplomacy.

>"I need to speak to the orc chieftain to negotiate our surrender"
>"Me disappointed, me want fight not talky talk with scardey man. Me crush you anyways."
>"But if you do that, your leader will murder you in front of your tribe after our army invades, and I'm sure you'd rather be alive. Also, have this dead goat."
>"Aright, me take you now."

Arbitrary amount of walking later:
>"So squishy flesh pig want to give me victory?"
>"Absolutely, you just need to sign this contract that describes the terms and conditions for our peaceful cohabitation."
>"Alright, but me want display of power."
>"Sure, here's Tim, he's not a very good fighter, but we'll put him in fancy armor so you can brutally tear his arms off in front of a crowd."
>"Okay... me also want-"
>"Ore right, you want ore to make more weapons."
>"Ya, me want lots."
>"Sure, here you go, you just have to sign this piece of paper and we'll also give you five pigs, two goats, and a cow."
>"Me like the sound of this! Humans not all bad."
>"But you have to swear a blood oath to abide by the terms and conditions of this treaty-"
>"Ya, ya, no more talk. Me want goats and this 'Tim'."
>"Sure, no problem, you just have to work occasionally in our mine, and we'll even pay for your labor."
>"Sounds reasonable."

A few years later:
>orcs are basically enslaved, have all their property taken, and can't retaliate for fear of mass extermination
>they're malnourished, their culture is destroyed, and we've ameliorated the best and brightest into the artifice of their oppression
>anyone who disagrees with the rule of law is allowed to protest, but not a single protester has ever returned from the rape dungeon
>slowly let them poison their own water supply with, rendering the vast majority infertile and sickly

See, problem solved.

>>"But if you do that, your leader will murder you in front of your tribe after our army invades, and I'm sure you'd rather be alive. Also, have this dead goat."
I think this may be the bit where you fail and get killed, and have your dead goat stolen.

"hurr humie thinks chief will know that I killed talky human. I just tell him I killed a shepherd and stole 5 goats."

it sounds like orks are slavs

>implying you send someone important to negotiate unarmed without an escort
Fancy armor user. You show up with a small group of fancy looking warriors, and instead of murdering everyone like you look capable of, you discuss things. If they act like morons, which they might, you firebomb wherever their children live in the night, then show up out of nowhere to offer some "humanitarian aid" for these poor orcs, then try again. If THAT fails, hire some mercenaries to act like fools and piss off the orcs, then murder the mercenaries in front of the orcs and try again.

Fire, pick off escaping stragglers with a ring of archers around the target area.

Be more skilled than them.

Subtle orbital bombardment.

Image MUST be unrelated. That village is not just populated by orks, but also Troll Hunters.