During the American War of Independence from those fiendish colonial expansionist and sadistic (Banastre Tarleton) British people, most of the American recruits were farm boys.
Not being used to drilling and completely unable to tell their left from their right, the drill serjeants tied a bundle of hay on the left shoe and a bundle of straw on the right.
Marching then became??????
Oh ja! JAS is correct I think too.