The Iron Shirts

A novelette scheduled for release on April 27th by Tor.com in Kindle format for the princely sum of $0.99 each. But early and buy often.

Product Description
In a world in which horses survived to flourish in 13th-century America, the wars and rivalries of thirteenth-century Ireland have new players: the mysterious warriors from across the Western Sea, called by some the “ó Gonklins.” They and their Irish hosts have much in common—enough to misunderstand one another far more than utter aliens ever could.