Cuir bouilli was used for cheap and light armour, although it was much less effective than plate armour, which was extremely expensive and too heavy for much to be worn by infantry (as opposed to knights fighting on foot). However, cuir bouilli could be reinforced against slashing blows by the addition of metal bands or strips, especially in helmets. Modern experiments on simple cuir bouilli have shown that it can reduce the depth of an arrow wound considerably, especially if coated with a crushed mineral facing mixed with glue, as one medieval Arab author recommended. In addition, "armour based on hide has the unique advantage that it can, in extremis, provide some nutrition", when actually boiled. Josephus records that the Jewish defenders in the Siege of Jerusalem in AD 70 were reduced to eating their shields and other leather kit, as was the Spanish expedition of Tristan de Luna in 1559. Crupper plate for horse armour, 16th century, north Europe Versions of cuir bouilli were used since ancient times, especially for shields, in many parts of the world. Although in general leather does not survive long burial, and excavated archaeological evidence for it is rare, an Irish shield of cuir bouilli with wooden formers, deposited in a peat bog, has survived for some 2,500 years. It was commonly used in the Western world for helmets; the pickelhaube, the standard German helmet, was not replaced by a steel stahlhelm until 1916, in the midst of World War I. As leather does not conduct heat the way metal does, firemen continued to use boiled leather helmets until WW2, and the invention of strong plastics. The word cuirass for a breastplate indicates that these were originally made of leather. In the Late Middle Ages, the heyday of plate armour, cuir bouilli continued to be used even by the rich for horse armour and often for tournament armour, as well as by ordinary infantry soldiers. Tournaments were increasingly regulated in order to reduce the risk to life, and in 1278 Edward I of England organized one in Windsor Great Park at which cuir bouilli armour was worn, and the king provided swords made of whale bone and parchment. Design for cuir bouilli armour for tournaments, from Le Livre des tournois, 1460s The account of the Battle of Agincourt in 1415 by Jean de Wavrin, who was present on the French side, describes the crucial force of English longbowmen as having on their heads either cuir bouilli helmets, or wicker with iron strips, or nothing (the last, he says, were also barefoot). A few pieces of Roman horse armour in cuir bouilli have been excavated. Evidence from documents such as inventories show that it was common in the late Middle Ages and Renaissance, and used by the highest ranks, but survivals are very few. In 1547 the Master of Armoury in the Tower of London ordered 46 sets of bards and crinets in preparation for the final invasion of Scotland in the war known as the Rough Wooing. In September that year the English cavalry were crucial in the decisive victory at the Battle of Pinkie Cleugh. The German Count Palatine of the Rhine had six sets of cuir bouilli horse armour for his and his family's use in the 16th century. Often the shaffron for the horse's head would be in steel, though leather ones are also known.