Paths of Glory by Irvin S. Cobb

You know how four of us blundered into the German lines in a taxicab; and how, getting out of German hands after three days and back to Brussels, we undertook, in less than twenty-four hours thereafter, to trail the main forces then shoving steadily southward with no other goal before them but Paris.

First by hired hack, as we used to say when writing accounts of funerals down in Paducah, then afoot through the dust, and finally, with an equipment consisting of that butcher's superannuated dogcart, that elderly mare emeritus and those two bicycles, we made our zigzagging way downward through Belgium.