Kantakouzenos then began all-out war on Bohemond, without success, despite Bohemond's defeat at Harran. He seized the harbour with a fleet full oif weapons, building materials and craftsmen, made countless assaults on the walls, built forts of his own, stretched a chain across the harbour to stop other ships and tried persuasion, all in vain. Bohemond came to try to stop the building, but found it complete. Kantakouzenos captured nearby forts - Argyrokastron, Marchapis, Gabala etc. up to the borders of Tripoli, making them subject to the Byzantines instead of the Muslims. Despite capturing the harbour and castle of Laodikeia, he was unable to take the citadel, popularly known as the koula; this was held by 500 Normans and 100 knights. When Bohemond heard of the capture of forts by Kantakouzenos and that the defenders of the akropolis were short of food, he loaded large quantities of supplies on to mules, gathered all his troops with those of Tancred and Raymond, and forced his way with the supplies into the koula. During this raid Bohemond and Kantakouzenos clashed verbally: Bohemond asked what he was doing, Kantakouzenos said he was enforcing the crusader oath to restore conquests to Alexios I (Laodikeia had been given then taken back); Bohemond said violence would fail: only money would take Laodikeia. Bohemond took the opportunity of the raid to replace the head of the garrison and his entourage, whom he did not trust, and to clear vineyards which prevented cavalry charges near the walls; he then returned to Antioch. Kantakouzenos failed to prevent Bohemond from resupplying Laodikeia, though his men attacked fiercely; he continued a furious siege after Bohemond's departure, with all kinds of siege-engines, but to no avail