Prelates were at the same time sent through all the countries of Europe, to preach peace among princes, and exhort them to unite against the common enemies of God. These prelates, clothed in the full confidence of the Holy See, were to engage cities and nobles to equip, at their own expense, for the Holy Land, a certain number of warriors, to serve there during two years at least. They promised remission of sins,[37] and the special protection of the Church[38] to all that would take up the cross and arms, or would contribute to the equipment and support of the soldiers of Christ. To receive the pious tribute of the faithful, boxes were placed in all the churches. At the tribunal of penitence, the priests were ordered to command all sinners to concur in the holy enterprise; no error could find grace before God, without the sincere will of participating in the crusade; zeal for the deliverance of the holy places appeared to be at that time the only virtue the pope required of Christians, and even charity itself lost some of its value, if not exercised in promoting the crusades. As the Church of Rome was reproached with imposing upon the people _burdens to which she only applied the tip of her own finger_, the pope exhorted the heads of the clergy, and the clergy themselves, to set an example of devotedness and sacrifices. Innocent ordered his gold and silver plate to be melted to defray the expenses of the holy war, and would allow none but vessels of wood and clay to be seen on his table whilst the crusade lasted.