Lockstep
In the United States, lockstep marching or simply lockstep is marching in a very close single file in such a way that the leg of each person in the file moves in the same way and at the same time as the corresponding leg of the person immediately in front of him, so that their legs stay very close all the time. Originally it was used in drilling soldiers. Each soldier stepped on the point just vacated by the foot of the soldier in front of him. Thus the soldiers stayed in position to form close files. Lockstep marching was a characteristic trait of American prisons of the 19th century. "Inmates formed in single file, right hand on the shoulder of the man in front, left hand on the side; the convicts then stepped off in unison, raising the right foot high and shuffling with the left." The reason for the shuffling step was the chain that connected the legs of a chain gang.
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