How did the U.S. Army use telephones during the Spanish-American War?

During the Spanish-American War, the U.S. Army utilized the telephone as part of its communication efforts. However, this military application was not extensive, and it did not make a significant material contribution to the development of voice telephony at that time. By the late 19th century, the Signal Corps had begun employing the telephone, alongside other technologies like the heliograph and observation balloons, to support its mission of managing communications and information systems.12