Got the rules yesterday - I can work out the number of coloured cards but how many ambush and flank march cards is not clear. Is there anywhere I can get a deck ?

3 ambush cards and 2 flank march cards (left flank and right flank).

You can get a pack of the old style cards here - http://lurkio.co.uk/lurk10live/index.php?main_page=index&cPath=138 - or as part of a set with tokens, etc. here - https://www.theplasticsoldiercompany.co.uk/product/ccc007-mortem-et-glorium-grass-play-set/ .