I'd like to quote from
Birdsong by Sebastian Faulks. Whether I can find the quote or not is entirely another matter, but I'll try. OK here's one, it's not what I was looking for but it does the same job.
On the way up [if i remember rightly this is going from the village to the trench] they were given wire cutters.
'I thought the guns would cut the wire' said bryne. [meaning the artillery]
Then, a few pages later..
Grey shook his head. 'The wire isn't cut, you know. I don't want you to tell you men, but I've been up down with these things [binoculars] and I can assure you for stretches of hundreds of yards there is no shell damage at all. The shells have just not gone off.
Then during the attack...
The gaps in the wire became packed with bodies.
So the wire was supposed to be cut by the artillery bombardment that went on for days before the attack. But it wasn't. The soldiers were given wire cutters, but can you imagine stopping to cut the wire in the middle of no mans land? So the soldiers all went for the gaps that were there, and all the germans had to do was train the machine guns on the gaps. Complete slaughter.
So in relation to WWI medic, the wire could exist at the beginning of the game as pretty good barrier, but then could become destroyed by the artillery as the game goes on. This would raise questions about improving the AI and everything... it might be better just not to go there. Or they could just clamber over it.