SoRCon 8 27 Feb - 1 Mar 2015 Basildon UK http://www.sorcon.co.uk Essex Games 27 Jul '15
Ignore that. There was a proposed rule amendment to accommodate ambushing siege piles that was later removed. However, that explanatory rule was not removed prior to printing.
Prior to that PDF. It is still possible that it isn't printed yet. That happened with the first edition rules (which were later replaced).