They wouldn't have injured themselves with straight up hammers in the first place. Sparring only even causes injuries at a very low probability now.
So maybe try making a new squad with the appropriate uniform and hammers. Undraft some of the ones with crossbows and wait till they drop their equipment. Then draft them into the new squad. If that still doesn't work I'd say this is a genuine issue.
Ya, I will do this, and in the meantime, just make more traps to fend off the goblin tides.
Also, what the fuck is with Lashers?! A goblin lasher with a copper scourge shattered my dwarf hammerlord's SPINE--THROUGH STEEL BREASTPLATE AND CHAIN!!! God.
Also, @people referencing danger rooms/training. They were highly trained in a danger room for several years. All were at least professional at both hammering and armour/shield wearing.
This was just ridiculous.
Also, what the fuck is with Lashers?! A goblin lasher with a copper scourge shattered my dwarf hammerlord's SPINE--THROUGH STEEL BREASTPLATE AND CHAIN!!! I tried the fight again (sent out a Hammerlord immigrant that I equipped in full steel and gave a steel hammer), and one lasher just raped him--after having both upper legs, his lower legs, and his upper arms broken, as well as losing his right true rib and a lung to steel crossbow fire. Lasher attacked first, broke his leg through the greaves then did the above. Happened in like 5 seconds. I was pissed (ctrl-alt-deleted out of that game as well).
Feels like fighting is just either really buggy or stupid-imbalanced (you're telling me a copper
whip will break someone's spine through both a rigid
and soft layer of armour made from a metal 3 big steps higher in the hierarchy?!). I will refrain from it as long as possible.