The German and Low Countries movement, the Brothers of the Cross, is particularly well documented - they wore white robes and marched across Germany in 33.5 day campaigns (each day referred to a year of Jesus's earthly life) of penance, only stopping in any one place for no more than a day. They established their camps in fields near towns and held their rituals twice a day. The ritual began with the reading of a letter, claimed to have been delivered by an angel and justifying the Flagellants' activities. Next, the followers would fall to their knees and scourge themselves, gesturing with their free hands to indicate their sin and striking themselves rhythmically to songs, known as "Geisslerlieder", until blood flowed. Sometimes the blood was soaked up in rags and treated as a holy relic. Originally members were required to receive permission to join from their spouses and to prove that they could pay for their food. However, some towns began to notice that sometimes Flagellants brought plague to towns where it had not yet surfaced. Therefore, later they were denied entry. They responded with increased physical penance.