From the announcement (note: all mentions of "this post" is referring to Corvus Belli's post, not the one here on TGN. Don't want you to reply here and be disappointed you didn't have a chance to win):
Happy National Day of Scotland! We draw 1 CALEDONIAN HIGHLANDER ARMY ARIADNA SECTORIAL STARTER PACK! To participate, you just need to comment on this Facebook post, or on Twitter using the hashtag #InfinityCaledonia answering the following question: “” Which ones do you prefer?” Everyone who post a comment during today, November 30th, will participate in the draw. We'll announce the winner December 1st. Good luck to everyone!