(1) Well, you're not crazy, Duum Thashuumtalata is flipping out, and it's not obvious why. He has already like ~5 hunting kills in the past, so I don't know what's up.
Maybe because he became legendary he doesn't like civilian work anymore .. that used to happen in old versions of the game. Is that still a thing?edit: After reading up a bit on the Wiki i tried a prescribed fix, turn off his hunting labor for a few ticks and back on. works like a charm, he quickly went and got arrows, took a nap, and then went out and hunted a bunch of storks. So, vanilla bug/feature.
(2) It's not like orcs don't know how to hunt in general. i made some extra bows and arrows and assigned about 5 other hunters, they're all happily out there blasting away like yosemite sams. The other hunters wiped out several herds of wildlife: giant hares, wrens, grimelings.
(3) Testing came to an end pretty quickly, as elven longbowmen appear on the ridge overlooking the whole base and we have no military ^^
From the point you loaded the game for me, it's certainly winnable if you prepare fast, you have a couple months.