After reading up on the game I understand there are 2 expansion plus a new standalone version.
My question is: Can I buy entrenchment either retail or download on its own, or do I now have to buy trinity to get entrenchment?
It does seem that you need to either get Trinity or Rebellion. However, as the expansions by themselves never went on sale, you can actually get both for less then the cost of both expansions if you wait for a steam sale or trade for a steam coupon.
