Greek plans for Antioch were complemented by the ambitions and needs of the westerners. By the winter of 1097–8, the resources of many of the lesser and some of the greater leaders of the armies were reaching exhaustion. Negotiations with the Fatimids of Egypt continued: an Egyptian embassy arrived at the crusader camp in February 1098. Agreement with the Egyptians would have reduced pickings in southern Syria and Palestine, making exploitation of northern Syria urgent and necessary. In the winter of 1097–8 elements in the Christian forces eagerly established themselves as de facto rulers of significant tracts of Antioch’s hinterland, even though the dangers of such loose investment of the city were well understood by a high command fearful of the army’s disintegration. Alone, the requirement to find winter quarters to rest and recover from the arduous march across the mountains of eastern Asia Minor scarcely explains the siege of Antioch, especially as the decision taken in October/November 1097 to invest the city closely exacerbated the difficulty of supplying such a large army. There was more to it than logistics. Of particular significance may have been the circumstances of Bohemund, who had attached himself closely to Byzantine interests since arriving at Constantinople in April 1097. It is possible that he hoped for, or even expected, some territorial reward from Alexius in Syria. The expedition into Cilicia by his nephew, Tancred, may have been conducted on his behalf.17
At Antioch his skills as a field commander propelled him to overall military leadership of the expedition in February 1098 against Ridwan of Aleppo. The near-disaster of the engagement with the forces of Duqaq of Damascus on 31 December 1097 in the Orontes valley, twenty-five miles south of the city, due in part to divided command, persuaded the leaders to appoint a single field commander. This suited Bohemund’s political ambitions. Lacking the forces or the money to compete with Raymond of Toulouse or Godfrey of Bouillon, Bohemund may have long regarded Antioch as a prize to further his own interests, although it was only in May 1098, with the army threatened with annihilation by Kerbogha’s relief force, that he showed his hand. The attempt to capture the city conformed to Greek policy. In theory, it provided a focus for a period of recuperation for the Christian host; it helped keep Egyptian friendship by threatening the Seljuk powers of northern Syria, allowing the Fatimids to recapture Jerusalem itself in July 1098. The siege of Antioch was, therefore, of general political significance as well as reflecting some misplaced confidence. Raymond of Toulouse reputedly argued in favour of the siege on the grounds that God would see them right as He had done at Nicaea and in Anatolia.18 In fact, Antioch almost destroyed the crusade. Yet the extraordinary chain of events forged a harder unity of purpose among the mass of the army, a newly strident militant identity and confidence in divine favour expressed in the willingness of the survivors, great and humble alike, to integrate into their language and behaviour the rhetoric, symbols and theatre of visionary religious enthusiasm.The siege of Antioch lasted from 21 October 1097 until the city fell on 3 June 1098, whereupon the Christians immediately found themselves besieged, Stalingrad-like, by the relief force under Kerbogha of Mosul until his defeat and flight on 28 June. Once committed, the Christians faced a series of potentially lethal crises stemming from their inability to surround Antioch, the precarious state of food supplies and a succession of Muslim relief expeditions. At no time during the seven and a half months of the first siege was the city entirely blockaded. Men, materials and intelligence could find ways in; the garrison was able to fire on, attack or ambush the besiegers more or less at will, inflicting both military and civilian casualties. Only in March 1098 was the Bridge Gate that led to the road to the port of St Symeon blocked by the construction of one of three counterforts (the others were built to the north of the city in November 1097 and opposite the George Gate to the south in April 1098). While the western troops could not force entry into the city, their numbers were too great for the Antioch garrison to dislodge. The stalemate was broken in June 1098 by treachery, not military action, and even then the garrison itself held out in the citadel a further three weeks, only surrendering the day after Kerbogha’s defeat rendered its position untenable.