Not hunting, but killing with melee weapons.
The answer is to tire the dragon out. While my mind is a bit hazy on the details, let's start with that this ain't a sprint, but it's a marathon. And we are going to need lots of manpower for this.
All creatures need to rest, and as a dragon is probably an ambush predator, it will not that unlimited endurance.
Stage One: Grounding, use every ranged weapon you have to make it stop flying. Aim for the wings. Big bolts, small rocks, don't matter, bring it. Unleash it. Don't get killed.
Stage Two: No Sleep, No Rest (For the wicked)
Now use horsemen with ranged weapons, bows will work, but slings will do, to keep the dragon awake. And if can, moving around. Keep this up for several days. Yes, days. Maybe a week or more. I don't know, just keep it up. Do this till it can't move anymore due to fatigue.
Stage Three: Hold in place with wires, nets, anything to stop it moving. You want to control the beast.
Stage Four: Aim carefully
Depending on your outlook of live and willingness to look awesome, you can kill the very tired dragon.
Ranged: Use a large bolt thrower. Aim carefully, shoot to kill. More is better.
Close Up: Bring your sword if you must. This here creature has lost the will, or the energy, to fight. I'll bring my axe if you don't mind, better for chopping necks.
Stage Five: Mount the skeleton some where you can boast about it. And make a nice painting of you slaying the dragon. Don't mention the details of just tiring out the dragon. Or the use of nets and ropes. No, in the end it was just you against a mighty dragon.