I have a question about this:
It was not long before the infectious rhythm was spreading throughout the ranks. Footweary soldiers started to pick up their step in cadence with the growing chorus of hearty male voices. Instead of a down trodden, fatigued company, here marched 200 soldiers with heads up, a spring to their step, and happy smiles on their faces. This transformation occurred with the beginning of the Duckworth Chant.
What is "pick up their step"? Dictionaries don't seem to cover this usage. Could it be military lingo?