This sound is from Peon Sounds: Warcraft III - Reign of Chaos

Peons are the humble workers of the Orcish Horde in Warcraft III: Reign of Chaos. They are relegated to menial tasks such as harvesting lumber and mining gold, but their labor is essential to the Horde's success. Peons are often downtrodden and mistreated, but they remain fiercely loyal to their clan. Despite their low status, peons can be a valuable asset in battle. They can be used to build fortifications and siege engines, and they can even be armed with crude weapons and sent into combat. In the hands of a skilled player, a large group of peons can be a devastating force.