For long marches the average distance seem to have been around 15 miles/day for most armies. Some cavalry raids did like 5-600 miles in around 14 days IIRC but was smaller units and with the loss of horses to fatigue etc.

40+ miles/day for infantry was possible but such forced marches was done for just a few days only.

http://www.ibiblio.org/pub/academic/...t/m/march2.asc


CBR