Standoff At Sunrise Creek by Stephen Bly (Stuart Brannon Series, Book 4) from Books In Motion.com

Stuart Brannon heads home to his Arizona Ranch, but he finds it occupied by interlopers from the Casa Verde Land Corporation claiming to hold a Spanish land grant on the property. Enraged, Brannon drives them off. Stuart is soon joined by several friends and neighbors in defending his home. Including a contingent of soldiers tracking down a band of Apaches, and Miss Harriet Reed who makes her attraction to the ex-lawman obvious. They are soon under siege by Casa Verde's fifty hired gunmen and a cannon sent to take back the property. Brannon fights for the only things left worth holding onto, his ranch, and the burial place of his wife and son. For Brannon, right and wrong seem perfectly clear, but at a terrible price, putting innocent lives on the line for the sake of honor.