Comment 13 for bug 1395238

There is a pre-existing signal == "blocked" variable that he used.

I won't be able to look at this in detail without my development machine, so I can only really contribute to this in about a month or so. Having soldiers that walk home walk through other soldiers as a last resort is OK though - we could also have them try X random steps first, but that would also mean more code that can go wrong.