Un clairon de cavalerie fait retentir son appel dans les terres de la frontière américaine

Create a historically accurate, highly detailed, realistic depiction of a United States Cavalry bugler during the American Indian Wars era, circa 1870–1890. The soldier is mounted on a sturdy cavalry horse or standing beside it, wearing an authentic U.S. Army cavalry uniform of the period: a dark blue wool cavalry jacket, light blue trousers with yellow cavalry stripes, a period-correct cavalry hat, leather cartridge belt, and riding boots. He holds a brass military bugle to his lips, sounding a cavalry call across the frontier. His uniform, equipment, horse tack, and bugle should reflect historical U.S. Army regulations and materials of the late 19th century. Include authentic leather saddle gear, reins, and subtle signs of wear from field service. His expression is focused and disciplined, conveying the responsibility of a soldier signaling orders to his unit. Set the scene on an expansive American frontier landscape, with golden prairie grasses, distant rolling hills, and a few cavalry troopers faintly visible in the background. Use natural late-afternoon sunlight, atmospheric depth, realistic textures, and a muted earth-tone color palette complemented by the deep blue of the uniform and the warm golden shine of the brass bugle.