March of the 4th Cavalry - 1897" is a history surrounding a brief period in the life of Trooper A. Jay Lacey during which he wrote a daily diary of a march from Fort Walla Walla, Washington to Yellowstone National Park. Included is a biographical sketch of A. Jay Lacey's life, brief histories of the Forts in the Northwest, a short history of the cavalry, rules and regulations under which Lacey had to live, his equipment and the subsequent participation of his Troop H and the 4th Cavalry in the Philippine War. While Lacey himself proved to be a bit of a mystery, his diary tells of the daily hardships of the march and opinions on the Towns he encountered, and it tells us much of the man himself. Lacey's diary should be of interest to military historians and the people residing along the route Troops D and H followed through Oregon, Idaho, and on into Yellowstone.