I know excactly what your going through!!the excact same thing happened to me nd my friend except we had no choice but to leave (something wrong with yard owners lease contract,but no notice was given,(although we didnt know what happened behind the scenes!) nd tracter was pulled up against gate so no one could get in :L finally we got in and saved the horses!!)i moved yards last march and i wish that the yard i was in was still up and running!!the old yards owner who leased the yard has set up a new yard but its not the same!!but the worst thing is is that the people who drove us out of the yard are getting away with it and now have a yard of their own on the same premises!!
Sorry i had a bit of a rant but the main point is that i no excactly what your going through!!good luck!!