The dispute delayed the crusade even further. Raymond left Antioch to attack Ma'arrat al-Numan, which was captured. Robert took part in this siege as well. Raymond then tried to bribe Robert and the other leaders to follow him instead of Bohemund; Robert was offered six thousand "sous", but each attempted bribe was ignored. Raymond continued south to Jerusalem in January, 1099, but Robert and Godfrey remained behind in Antioch until February. They rejoined Raymond's army at the Siege of Arqa. In June, Robert and Gaston IV of Bearn led the vanguard which arrived at Ramla, and with Tancred, he led an expedition into Samaria to find wood in order to construct siege engines for the Siege of Jerusalem. When Jerusalem was captured on 15 July, Robert supported Godfrey's claim over that of Raymond, and on August 9 marched out with him to meet the Fatimid army under al-Afdal Shahanshah which was coming to relieve Jerusalem. Robert formed part of the centre wing in the ensuing Battle of Ascalon, which resulted in a crusader victory. However, Godfrey and Raymond quarrelled over possession of Ascalon, and even Robert could not support Godfrey in this dispute; the city remained uncaptured, although the victory allowed for the establishment of the Kingdom of Jerusalem.