Similarily to the above post, I just got a 7 Goblin ambush (consisting of wrestlers) along with a human caravan. It was spotted by a kitten, RIP. Anyway, this is still early on in the fort, second year. My military is still composed of just those two Champion Wrestlers and training swordsdwarves.
Luckily, the ambush was quite far away from my fort when spotted, and the wagons and humans safely got in. I debated on whether to raise my drawbridge or not, and decided to leave it down to see if I could take the goblins. As the goblins charge into my two rows of stone-fall traps, I send in my four soldiers. Naturally, they tear them limb from limb, the only injury being one of my Champion Wrestlers, who got a minor spine injury and rested it off after the fight.
In other news, after the ambush I looted a ridiculous amount of Giant Cave Spider silk clothing from them, just in time to begin trading. I bought a large amount of cloth, two anvils, and various other objects. Now that the ambush is over things have gone back to normal. I assigned a Sheriff and got my miners to dig out extra noble rooms for the future, and a jail. Also working on breeding my dogs so I can get a few war dogs.
And those two Champions are still guarding my fort entrance, never allowing the vile forces of darkness in. Once I get my metal production kickstarted with next year's human caravan, I'm going to outfit them in full steel plate and let them have some fun when sieges start.