Several Choctaw serving in the 142nd Infantry suggested using their native tongue, the Choctaw language, to transmit army secrets. The Germans were unable to penetrate their language. This change enabled the Americans to protect their actions and almost immediately contributed to a turn-around on the Meuse-Argonne front. Captured German officers said they were baffled by the Choctaw words, which they were completely unable to translate. According to historian Joseph Greenspan, the Choctaw language did not have words for many military ideas, so the code-talkers had to invent other terms from their language. Examples are "'big gun' for artillery, 'little gun shoot fast' for machine gun, 'stone' for grenade and 'scalps' for casualties." Historians credit these soldiers with helping bring World War I to a faster conclusion.