Running Wolf (Harlequin Historical Series #1239)

Rival tribes… 

Running Wolf is a valiant Sioux warrior. During his first raid as war chief, he captures a surprising Crow enemy—a woman! This spirited fighter is unlike any he's ever met. Her beauty and audacity are entrancing, but threaten his iron resolve… 

…rival passions 

Snow Raven must focus on freeing herself, not on the man who keeps her captive. But as she falls deeper under Running Wolf's spell, she realizes he is her warrior—and she'll risk everything for him!