General Joe Stilwell's march/retreat from the Japanese through Burma took 20 days.
He covered 140 miles in that time, about 1/2 of his desired rate of travel.
http://findarticles.com/p/articles/mi_m0IAV/is_2_90/ai_76736958/pg_1?tag=content;col1
And let us remember, Those soldiers were not in good health any longer.
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I do the things that I must, and really regret, are unfortunately necessary.
RIP OBG