Righto. This is my (6th?) adventurer after that last one which I retired in a nearby town.
I was asked to kill an ettin in a cave so... cool. I bring my dwarfy self to the cave, jump in, and whoa. Cave spider. I threw a crossbow bolt at it and it dieded. Hrm.
Walk a few steps. WHOA. Cave spiderS. Threw crossbow bolt and ran back a few squares. Got a message: "Giant cave spider has bled to death" Yey.
Ran back in and accidentally sliced off the torso of the third one there. It dieded. COOL!
Walked forward a bit more, found the ettin. Smacked it around. Gouged out all its eyeballs. Lopped off its arms. Wandered back to the giant cave spider torso and picked it up. Threw corpse into the chest of the ettin and watched the fireworks. Then grabbed the corpse and started walking back out.
3 squares from the exit. Giant cave spider. What the hell... Threw a crossbow bolt at it. Glanced off. Threw another crossbow bolt at it. Glanced off. Uh oh... it's coming closer. Searched inventory. Threw an Athel Arek 1054 gold coin at it. Black eye. Uh oh. Threw the corpse of the ettin at it. It explodeded.
And that's how my (6th) novice(y) adventurer killed 4 giant cave spiders by himself in 10 minutes.
To be fair, my adventurer was clad in masterwork steel armour from head to toe in both masterwork chainmail and platemail and was wielding a masterwork obsidian sword and a masterwork steel shield. It's a good thing that weapon depots remain in the same place in your old fortresses.