The sense of a carefully prepared strategy was reinforced in the early months of 1218. Even Andrew of Hungary’s precipitate departure from Acre with many of his Hungarian followers in January 1218 may have played an incidental role. Unusually, he travelled west overland, giving money to northern Syrian castles, arranging marriages for his sons with Armenian and Greek princesses as well as probably passing through Seljuk territory.52 There may well have been a subsidiary diplomatic purpose in this unusual itinerary to assist shoring up the crusaders’ distant northern flank. To allow Acre or Antioch to be attacked while the main armies fought in the Nile Delta would have made no sense. That the Egyptian attack was planned by this time cannot be doubted, as immediately the northern fleets arrived in late spring an assault was launched. When the fleets’ commanders assembled with the duke of Austria and the local lay, clerical and military order leadership, their support for the Egyptian campaign was, according to James of Vitry, who was there, unanimous. The only issue in the mind of the king of Jerusalem, John of Brienne, was whether the crusaders should sail for Alexandria or Damietta. Regarded by common consent in Outremer as ‘the key to Egypt’, the choice fell on Damietta.53 By the end of May, the crusaders had established a bridgehead on the left bank of the Nile opposite Damietta and began to probe the city’s formidable defences. For the next three and a half years, this narrow waterlogged region of flats, marsh, canals and rivers remained the focal point for the thousands who joined the crusade from the west, the longest static campaign in the history of the eastern crusades.
Damietta, set among the silt, lagoons, sandbars, dunes and mud flats at the mouth of the main eastern estuary of the Nile, was, in Near Eastern terms, a relatively minor port, with a population of perhaps 60,000, smaller than Alexandria, much smaller than Cairo. However, because of its strategic importance, guarding one of the main routes of access to Cairo, it was well fortified with walls and protected by canals and river channels. The warfare around Damietta fell into four phases. After the initial landings in late May 1218 and the establishment of a camp opposite Damietta, strenuous assaults led to the taking of the so-called Tower of Chains, which stood in the Nile, midstream between the crusaders’ camp and the city, on 24 August 1218. A series of increasingly desperate efforts to secure a hold on the right bank of the river, as well as some fruitless sallies against the city walls led, in February 1219, to the complete investment of the city when the new Sultan, al-Kamil, withdrew from his camp at al-Adilyah. During the summer of 1219, despite some heavy mauling, the crusaders held their positions. At this moment Francis of Assisi arrived in the crusader camp.54 After accurately predicting the crusaders’ failure to dislodge the Muslims from their camp at Fariskur, he was reluctantly given permission to cross through the lines on a hopeless mission to convert the sultan. Francis barely escaped with his life. The failure of Ayyubid relief, increasingly dire conditions within the city and consequently negligent defence led to the fall of the city in November 1219. The nearby port of Tinnis fell soon after. The third phase witnessed a long, curious twenty-one-month period of edgy diplomacy and phoney war, during which the leadership squabbled as to the best strategy to adopt; whether to accept Muslim peace terms, as preferred by King John of Jerusalem, or to press forward to capture Cairo, a policy supported by the increasingly assertive Cardinal Pelagius. These disagreements were conducted against a backcloth of regular crusader departures for which new arrivals failed to compensate. A growing impatience at inaction was exacerbated by the failure of Frederick II to honour his commitment to join the Egypt campaign. The final act saw a failed march on Cairo in August 1221 and the Christian evacuation of Damietta the following month. While a few crusaders remained to help defend Outremer and a trickle of new recruits continued to travel east, the surrender of Damietta marked the end of the central action of the crusade. The lesser expeditions of 1227 and of Frederick II in 1228 acted as codas for the Damietta enterprise as well as setting a pattern of continual small-scale western military assistance for Outremer that characterized the rest of the thirteenth century, with the exception of the French crusade of 1248–50.
The Damietta campaign of 1218–21 revolved around problems of leadership, reinforcement, technology and diplomacy. The delay in capturing Damietta raised questions over the central thrust of the Egyptian strategy. Were the crusaders there to conquer Egypt or to force a panicked Ayyubid sultan to restore the kingdom of Jerusalem? All the central features of the operation touched on this issue. Who determined the crusade’s objectives? Did the western host possess the technical ability successfully to prosecute a campaign in the Delta and an attack on Cairo? Were there enough troops to achieve and sustain such a conquest? How far could negotiation with Ayyubids or other Near Eastern powers guarantee the security of a restored Jerusalem? In the event none of the answers to these questions proved satisfactory for the crusaders. It said much for the enthusiasm and levels of commitment aroused during the recruitment process that the effort was maintained for so long despite very modest material gains.
The problem of leadership arose as soon as the vanguard of the crusader fleet reached Egyptian waters on 27 May 1218. In the absence of most of the more important leaders, delayed by contrary winds, the crusaders elected Count Simon of Saarbrücken to lead the landing and the establishment of a camp on the west bank of the Nile opposite Damietta.55 Born of immediate military necessity, this was only a temporary measure, probably reflecting the Rhenish composition of the ships in the vanguard. Once the full army had assembled, ‘with the agreement of all’ (par accort de toz),56 John of Brienne king of Jerusalem was chosen as leader of the host. Although his partisans later claimed that he had also been promised rule of any conquests made, his position was considerably less dominant than that of Richard I or even Conrad III on earlier campaigns. John’s leadership was of military convenience rather than recognition of political authority. Western lords were unlikely to accept his orders unconditionally, not least because they led their own contingents, many tied to their lords by close regional, tenurial or familial association. The papacy, in the form of the legate Pelagius cardinal bishop of Albano, who arrived in September 1218, demanded influence, supported by the significant amounts of treasure derived from the 1215 clerical tax, redemptions and donations. Control of these funds placed great practical power in the legate’s hands. Oliver of Paderborn recorded at least two occasions when he used the central fund: in May 1219 to help the Pisans, Genoese and Venetians conduct an assault on the walls of Damietta and in 1220, when he hired French and German troops to join his retinue.57 A papal account of 1220 recorded payments made to Pelagius from the papal Camera (i.e. treasury) and the 1215 tax of well over 35,000 silver marks and more than 25,000 gold ounces.58 This pivotal role in funding as much as his supposed arrogance and imperious self-confidence propelled Pelagius into playing a key part in tactical decisions in an army whose lay recruits continually found themselves running short of cash.
King John’s own position was less than secure. John of Brienne, a nobleman from Champagne, had carved a career for himself out of his military usefulness in high places. However, despite a number of golden opportunities, through lack of political acumen or luck, he repeatedly failed to translate his skills into a throne of his own. In 1210 he had arrived in Palestine and married Queen Maria, the daughter of Conrad of Montferrat and Isabella I. She had died in 1212, leaving John technically regent for their infant daughter Isabella II. John was remarried, to an Armenian princess, daughter of King Leo II (d. 1219), through whom and on behalf of their son he laid claim to the Armenian throne. These foundered on his wife’s and son’s deaths at Acre in 1220 only shortly after he had withdrawn from the crusade army in Egypt to pursue their Armenian inheritance.59 Losing even his Jerusalem position when Isabella II married Frederick II in 1225, John campaigned in Italy for the pope and finally served as regent for Baldwin II and co-emperor in the Latin Empire of Constantinople. The political vulnerability of King John was emphasized by
the crusade’s collective leadership with its constantly changing membership. This was partly a product of the expedition’s composition, partly of its constitution. The insistence that decisions were reached collectively could involve, as they had during the Fourth Crusade, the wider military community of the host. The crucial debate in the spring of 1220 on whether or not to advance from Damietta to attack Cairo was decided, against the advice of Cardinal Pelagius, the archbishop of Milan and other luminaries, by the opinion of the knights, not the divided leadership.60 The crusaders stayed put. At Sharamsah in July 1221, the mass of crusaders overruled John of Brienne’s counsel to withdraw.61 As on every previous large crusade, decisions of the high command had to pass the close and critical scrutiny of their troops’ public opinion in ways unusual in normal contemporary western warfare. The lack of political cohesion, the rhetoric of voluntary service and the reality of sworn communal rules of discipline created a robust and, for the leadership, at times awkward and unpredictable climate of participation.
Overshadowing everything was the promise of the appearance of Frederick II, held out from the arrival of the Germans in 1217–18 and Pelagius in the autumn of 1218 to the appearance of Matthew of Lesina in 1220–21, repeated regularly by the pope and earnestly desired by crusaders. Frederick, although not yet the figure of self-promoted glamour and outrageous ambition he was to become, seemed, in his inheritance of Sicily, Germany and the imperial dignity, to represent a new secular order in Christendom, for the moment allied with the papacy. His arrival was regarded as totemic of optimism and success. As Peter of Montague, Master of the Temple, put it, the emperor was ‘long expected’.62 As late as 1221, one compelling argument against accepting apparently generous peace terms was that Frederick had forbidden any deal prior to his own arrival.63 No secular figure could replace him, not even his representatives in 1220–21. Frederick’s absence unsettled tactical considerations and strategic planning. Cardinal Pelagius, representing the other universal power, had the unenviable task of trying to maintain the crusade until the emperor was ready to join it.
This was made considerably more difficult by the rhythm of departures and arrivals. The regularity of the two annual passages, the number of ships and crusaders carried provided remarkable testimony to the development of Mediterranean shipping and trade routes during the twelfth century. It did little to support an effective military campaign. A key element in previous long crusading expeditions had been the emergence of an esprit de corps based on shared expedience rather than shared origins – 1097–9, 1191–2, 1203–4. During the operations around Damietta from May 1218 to September 1221, death or departure deprived the Christian army of consistent command. Not a single great western lord remained in the Nile Delta for the complete duration of the war. Oliver of Paderborn was one of a very few leading clergy who did. In contrast with the Third Crusade, the Outremer barons, clergy and the masters of the military orders, spent significant passages of time away from the front line. Pelagius’s continuous presence from the autumn of 1218 of itself added to his influence. Each newly arrived contingent was balanced by the departure of others.64 Few seemed reconciled to staying until the Egyptian campaign was completed or Jerusalem recovered. As with the Albigensian wars, crucesignati appeared to believe that seeing only limited active service in the cause of the cross was sufficient to merit the indulgence. Although Quia Maior and Ad Liberandam indicated that Innocent III envisaged a campaign lasting three years or more, in neither was any conditional time limit set for the enjoyment of the plenary indulgence. The temporary quality of the crusaders’ commitment exerted a powerful influence. Even the legate’s threats of excommunication failed to prevent some, such as the count of Katzenellenbogen in 1220, from deserting.65 In October 1218, the news of crusaders leaving encouraged the Muslims to attack the Christian camp. Later, the pressure to retain as many troops as possible on station prompted Pelagius in 1220–21 to argue for a more aggressive policy. Without fighting and the prospect of booty or success, hanging about in Damietta indefinitely was hardly an attractive or sustainable option. Equally damaging, the incessant merry-go-round of arrivals and departures consolidated the regional, national and social divisions that dominated the public and private debates on the course the campaign should take, a disunity fed by the lack of an accepted single leader.
Technology assumed a central place in the Egyptian campaign. Eyewitnesses noted when new crusaders brought with them siege equipment, as they had during the siege of Acre during the Third Crusade. Apart from the contest of throwing machines on both sides, much of the fighting was determined by the respective merits of the attackers’ and defenders’ engineering and shipping as the struggle was played out across the Nile around Damietta and later, in the summer of 1221, upstream towards Cairo. Water protected and threatened by turns in a landscape where military aggression was fraught with hazard as it almost invariably required crossing rivers or canals. The first great obstacle, the seventy-foot-high Chain Tower, situated in the Nile between Damietta and the crusader camp, was separated from the Christian-held left bank by a narrow channel. From the tower to the city walls ran a chain, restored by Saladin, that was raised to prevent unwelcome river traffic proceeding up the Nile. It was only captured in August 1218 thanks to an elaborate floating fortress designed by Oliver of Paderborn himself.66 Although paid for and built by the Germans and Frisians, the design – a fortified platform equipped with scaling ladders suspended above two large ships lashed together – resembled the devices constructed by the Venetians before the walls of Constantinople in 1204. A number of Venetian maritime experts may have been on hand, left behind to find new clients when Andrew of Hungary decided to return home overland.
Oliver’s engine was needed because the garrison of 300 in the Chain Tower could not be starved out as a bridge of boats supplied the tower from Damietta. Another pontoon bridge further upstream protected the Ayyubid camp at al-Adilyah, south of the city, as well as allowing Muslims to attack crusader positions across the river. This bridge became the focus of operations for both sides, producing one of more remarkable engineering feats of the campaign. To outflank the bridge, the crusaders dredged and enlarged the al-Azraq canal, which ran for some miles, linking the Mediterranean coast to the Nile south of the Christian camp and upstream of Muslim defences, which now included hulks scuttled in the main channel of the river.67 The enlargement of the canal took a month. Any immediate advantage was dissipated by a devastating storm and flood of seawater in late November that almost engulfed the two hostile camps, followed by an epidemic, possibly of scurvy. Christian fatalities may have been as high as 20 per cent.68 However, after a grim and unsettled winter, the engineering efforts of the previous autumn contributed to the occupation of the Ayyubid camp on the right bank of the Nile in February 1219 which had been deserted as a consequence of an attempted coup against the new sultan al-Kamil.69
Thereafter, the lack of adequate technological capacity first blunted the crusaders’ attempts to take the city during the summer of 1219 and later, on the march south in July and August 1221, placed the western host at a fatal disadvantage. The lack of manpower, exacerbated by the departure in the spring of 1219 of Leopold of Austria and many others the following autumn, proved significant. This left the crusaders outnumbered and unable to press forward attacks. Muscle power, human or animal, provided the energy upon which the army depended, a role taken in much later centuries by gunpowder, petrol and electricity. Among the skills well represented on all crusading expeditions, those of the carpenter stand out. John of Brienne employed one of his, Aubert the Carpenter, to reconnoitre the deserted Ayyubid camp in February 1219.70 On land or water, wood technology occupied a central place in medieval warfare. The Nile Delta presented peculiar problems, not least its lack of suitable local timber, a point recognized by Innocent III’s attempt to ban western exports of wood or ships to Egypt in 1213 and 1215. From the winter of 1218–19, although able to maintain a blockade of Damietta once the city was e
ncircled in February, the crusaders made no progress and were only barely able to resist counter-attacks by Sultan al-Kamil, now stationed further to the south. In the event, the blockade worked, starving the city so that resistance slackened, an unguarded section of wall leading to its fall in November 1219. The main bulk of the Muslim forces were deliberately never engaged. When, finally, almost two years later, they were, the crusaders’ technological limitations were exposed. They lacked sufficient flat-bottomed barges to carry the bulk of the army and so had to maintain a precarious link between the land army and many of its leaders, including the legate, on board ship. This form of amphibious warfare was beyond the experience of many, the departure of Frisians and Netherlanders over the previous two years being keenly felt. The absence of adequate craft in sufficient numbers allowed the Egyptians to outmanoeuvre the crusaders. By using shallow side canals, the Muslims cut them off from their base at Damietta and imperilled any chance of retreat once the Christians pressed southwards into the heart of the Delta beyond Sharamsah in late July 1221.71
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