This is coolbert:
From CIC # 1 by Professor Al Nofi the Bulgarians having within the historical record troops also able to march at speed for distance with load, and MOST IMPORTANTLY HAVING A SMALL PERCENTAGE [LESS THAN 2 %] OF THE TROOPS NOT COMPLETE THE MARCH AS A UNIT.
"During the Serbo-Bulgarian War of 1885, one Bulgarian infantry regiment went into combat after marching 60 miles [100 kilometers] in 32 hours in full kit with a falling out rate of only one man in 70, a record exceeding that of Napoleon's Grand Armee in 1805 and Jackson's 'Foot Cavalry' in 1862."
These Bulgarians not "stripped" bur evidently carrying full load. That "stripped" soldier without full kit perhaps having to be cold, wet, hungry, thirsty, exhausted, etc. BUT that being a part of his soldierly duty and to be accepted. OR am I speaking in the manner of: "those with the loudest voices are often furthest from the scene of the action"?
ALSO only select units trained to such a high degree of fitness and proficiency and those circumstances very few indeed where such extreme marching ability even be needed.
MARCHING TO COMBAT TOO EXPECT A HIGHER PERCENTAGE OF TROOPS TO FAQLL BY THE WAYSIDE! FEAR AS MIGHT BE GENERATED BY THE ANTICIPATE OF CARNAGE ON THE BATTLEFIELD CREATING BODILY WEAKNESS!