So I have a fort wih no underground presence. It is only partially constructed so when the neighbourhood necromancer came a calling my only option was to hole up in the small keep I'd stocked with food for just such an emergency. One year later and, sick of waiting, I unveiled a small trap corridor to aid my super elite four dwarf military in taking down the thirty-odd zombies.
Here's where the odd behaviour starts. When I first open the gates, my one soldier runs towards the enemy the moment they're within normal vision range - 20 tiles - despite there being 3 separate solid wooden walls between them.
Luckily the nearby undead (7 total) were rekilled and I got Urist McOmniscient the Angry back inside safely. A few more openings go as planned, no hiccups, and eventually the west side of the river is clean, but half the original undead are stuck on the other side. My keep is on the east side, and the gate opens on the west side with no eastern access (I kept the east gate sealed). When I opened the trap corridor this time, in the hopes that the remaining undead would meander round through the southern map edge where the water level is low because of drainage, Berserk McXrayeyes runs out onto the bridge, jumps off north without being attacked by anything or gaining line of sight on any hostile (I checked him for suicidal stress, but he was fine), and walks along the bottom with dabbling swimming skills to the eastern bank, where he gets out, walks around the keep, hugging the north wall, and charges at the nearest zombie.
He was the only one who displayed this sort of behaviour. He moved fast and direct as if he'd seen an enemy the whole time. Is anyone else experiencing dwarves with this sort of invader-like aggression?
tl; dr Note he was not on station orders, just training on the inner end of the trap corridor, and he pathed through 7/7 water with no swinming skill to get to enemies he couldn't see until he last moment.