Love is a Battlefield, A Walk in the Park Series by Annalisa Daughety published by Barbour
Left at the altar, her old job filled by someone else, all Kristy O'Neal wants is for life to return to normal. But working as a seasonal park ranger at Shiloh National Military Park alongside Ace Kennedy, the man who stole her job, may be more than Kristy can handle--especially when she realizes she's falling for him. But Kristy doesn't believe in true love anymore. With the history of her beloved park and his own ancestors in his arsenal, Ace begins the battle to prove to Kristy that true love does exist...before he loses her forever.