To this view of the Crusades, as a business of high
political importance, the best of the laymen who led the Christian armies were sincerely
attached. Many others, equally sincere but governed more by sentiment than
reason, were moved by the desire to see the Holy Places and secure them as the
common property of Christendom. But the most pertinacious and successful of the
commanders went eastward, as their kinsmen went across the Elbe or the Alps or
the Pyrenees, to carve out for themselves new principalities at the expense of
Byzantine or Saracen, it did not matter which. Naturally the sovereign princes
who took the Cross do not fall into this category. For them an expedition might
be either an adventure, or the grudging fulfilment of a penance, or a bid for
the esteem of their subjects; but it was often a conscious sacrifice of
self-interest and national interests to a higher duty. However low their
motives, it would not have paid them to turn aside from the task enjoined upon
them by European opinion. Even Frederic II, the least Christian of Crusaders,
who only accomplished his vow to put the Pope his adversary in the wrong,
fulfilled his undertaking to the letter before he ventured to return.
But a
Crusade controlled by men of lower rank tended to be a joint-stock company of
freebooters. For every Crusade the Pope was, to a certain point, responsible.
He issued the appeal, he tuned the pulpits; he invited contributions from the
laity and exacted them from the national churches; he provided for the enforcement
by ecclesiastical censures of all Crusading vows. In the choice of leaders, and
in the preliminary councils of war, he had a claim to be consulted. One or more
of his legates normally accompanied the armies. But, if the generals chose to
ignore his suggestions and to override his representatives, after the march had
once begun he was powerless. Usually, it is true, his views would appeal to the
rank and file, exempt as they were from the temptations presented to their leaders.
But the Common soldiers could only leave the host if they had the means of
paying for themselves the expenses of the homeward journey. Often they
protested against the uses to which their arms were put; but very seldom were
they able to enforce a change of policy.