Eirelan had an interesting premise but I found that the story lagged too much, making it difficult not only to engage with the characters but also the entire point of the story (the goals of the characters, of who/why they're fighting, etc). Some of the story threads and characters piqued my interest but there's so much focus on the battle preparation/battle exposition/the waiting in between that I just lost my interest. Fans of military detail in fantasy or even historical fiction will enjoy this novel but I personally found it too slow for my liking. I did however think that the Celtic elements infused in the Province's culture was well done.
My complete review of the novel was originally posted at caffeinatedlife.net: http://www.caffeinatedlife.net/blog/2013/01/10/review-eirelan/