Thank you for that comment, echnaton. (By the way, your “name” reminds me of Akhenaton’s.)
Unlike embarking on a jihad, someone desiring to embark on a Crusade had to go through a special rite or ritual during which a cross was sewn or painted onto the person’s clothes. This cross meant that the person was going forth for the Cross (that is, is a Crusader) and, as such, enjoyed the privileges bestowed upon such penitents. (“Taking up the Cross” was considered a penitential act; like pilgrimage (whose symbol was, I believe, a scallop), those embarking on a Crusade were granted certain spiritual and secular rights or privileges, including immunity.)
Each Crusade in each area had to be approved by the proper ecclesiastical authorities (usually the Pope). In some cases, the Pope exhorted certain areas or people to “take up the Cross” and in other cases the Pope declared that the obligation of taking up the Cross could (or ought) to be fullfilled by undertaking a campaign to somewhere other than the Levant. Examples include exhorting the French (yes, at one time they did fight) to launch a Crusade against the Albigensian (did I spell that right?) heresy, and exhorting the Spanish to expell the Muslim rulers and restore Iberia to Christian rule.