al-Kutami wrote the oft-quoted verses: "Our business is to make raids on the enemy, on our neighbor and our own brother, in the event we find none to raid but a brother." William Montgomery Watt hypothesized that Muhammad found it useful to divert this continuous internecine warfare toward non-Muslims, making it the basis of the Islamic holy war. As a form of warfare, the razzia was then mimicked by the Christian states of Iberia in their relations with the taifa states. A large-scale raid organized by an Iberian Christian king in Muslim territory was called a fonsado; this is perhaps the earliest word used for such raids. In contrast, the word cabalgada was introduced later to denote a smaller raid, whose main purpose was plunder. The word algara referred to either a raiding party, or perhaps to a yet smaller raid. A 12th-century Christian chronicler wrote: "Every day large bodies of knights leave castles on what we call algarades and roam far and wide, pillaging all the territory of Seville, Córdoba and Carmona, and setting it all alight." A 13th-century Iberian example of a raid called cavalgada is the operation launched at the order of Ferdinand III of Castile in April 1231. It departed from Andújar, and first advanced towards Córdoba, leaving a trail of destruction in its path. The raiders hit Palma del Río, killing many inhabitants. Thereafter they proceeded as far as Seville, which they bypassed heading towards Jerez and Vejer. When they were intercepted by an army of Ibn Hud near the Guadalete river, the battle of Jerez occurred. The Castilian raiders managed to rout the Moorish army, and withdrew with booty, but not before they killed all their prisoners. The raid and battle were amply described in the chronicles of Alfonso X of Castile. Development According to historian Kelly DeVries, chevauchée tactics developed into a regular strategy in the Hundred Years' War following the Black Death when Edward III of England no longer had the troops to engage in regular battles. Specific tactics were "a quick cavalry raid through the countryside with the intention of pillaging unfortified villages and towns, destroying crops and houses, stealing livestock, and generally disrupting and terrorizing rural society. Most of the troops used in a chevauchée during the Hundred Years War were made up of light horse or hobelars. The mercenary groups known as the 'Free companies' were also prominent in