I served in the Royal Engineers from 1968 to 1980. During this time I only did a single tour of Ulster, in '79. The folowing story I heard from two sources, one military, the other civilian. The civilian was an old farmer in Keady. I was there as part of a detail cutting down an Ash tree to make way for a helicopter landing pad. This was shortly after Dessie O'Hare was shot up trying to ambush an Army patrol, something the farmer congratulated me on! He then went on to relate the story that I had already heard. The story is that the IRA decided to hijack a peaceful, though banned, Civil Rights march to gain a propaganda coup over the Army. They did this by towards, but not at, Army personel in an attempt to goad them into firing on unarmed civilians. Though this story is backed up by several recent revelations, I do not claim it as true as I have no proof. But it is a possibility that does need investigating.