n the same sense of discipline as the
"regulars" there had been no Norman Conquest.

With regard to marching, General T. J. Jackson once observed, in reply
to an allusion to his severe marching, that "it is better to lose one
man in marching than five in fighting." Acting on this principle he
invariably surprised his enemy, the most notable instances being his
surprise of Milroy at McDowell, of Banks and Fremont in the Valley, of
McClellan's right at Gaines's Mill, of Pope at the Second Manassas, and
his last and greatest of Hooker at Chancellorsville.

TIME.--Time is often a supreme factor in warfare, and the superior
mobility of troops will gain for their commander a great strategical
advantage. Reserves are of little value if they cannot be concentrated
at the right spot at the right moment, and steamships, railways, and
mechanical transport thus play an important part in war. The mobility
of infantry is often the deciding factor in battle, and campaigns have
been won by the legs of soldiers as much as by their arms.

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WEATHER.--The weather is an important factor in war, and its influence
appears to have increased in modern times. Mists and fogs militate
against observation by aircraft, and poor visibility interferes with
the work of artillery. Roads are broken up by the weight of modern
traffic, and in a shelled area the craters become impassable after a
few days rain, making the supply of food, stores and ammunition a
serious problem. Such conditions multiply the difficulties of attack,
as the ground of the encounter consists principally of hastily dug
trenches which become running streams of mud; and they assist the
defence, as the pursuit is delayed, while the ground behind the
defending force is less liable to be churned up by shell fire. The bad
weather of September, 1916, caused a delay in the Allied advance
against Sailly-Saillesel and Le Transloy and made it necessary to
abandon the plan at the moment when previous successes seemed to have
brought it within the grasp of the commanders. As the season advanced
and the bad weather continued the plans of the Allies had to be
reduced, and the brilliant successes already achieved afforded some
indication of what might have been accomplished had the weather
permitted the plans to be carried out as originally intended.

HEALTH.--"Wars may be won or lost by the standard of health and moral
of the opposing forces. Moral depends to a very large exten