It seems to me that Joel had a vision of a robot army in the Last Days:
Joel 2:7 They run like mighty men, They climb the wall like men of war; Every one marches in formation, And they do not break ranks. 8 They do not push one another; Every one marches in his own column. Though they lunge between the weapons, They are not cut down. 9 They run to and fro in the city, They run on the wall; They climb into the houses, They enter at the windows like a thief.
Thomas Nelson. NKJV, Holy Bible (p. 3645). Thomas Nelson. Kindle Edition.