Retreat was now the only measure available, and it began on the night of the 20th of May. The battering-train of twenty-three pieces was left behind. The wounded and field-guns had been suddenly embarked in country vessels, and sent towards Jaffa. Sir Sidney put to sea to follow them, and the vessels containing the wounded, instead of attempting to continue their flight, steered down at once to their pursuers, and solicited water and provisions. They received both, and were sent to Damietta. "Their expressions of gratitude were mingled with execrations against their general, who had thus," they said, "exposed them to perish." As the garrison was without cavalry, the pursuit of the flying enemy could not be followed with any decisive effect. But the gun-boats of the English and Turks continued constantly discharging grapeshot on them, so long as they moved within reach of the shore, and the Turkish infantry fired on them when their march turned inland. Their loss was formidable; the whole tract, between Acre and Gaza, was strewed with the bodies of those who died either of fatigue or wounds. At length two thousand cavalry were put in motion by the Turkish governor of Jaffa, making prisoners all the French who were left on the road, with their guns; and nothing but the want of a strong body of fresh troops to fall on the enemy seems to have prevented the capture of every battalion of that army, which, but two months before, had boasted of marching to Constantinople. It ought to be remembered, as the crowning honour to his human honours, that the man who had gained those successes, was not forgetful of the true source of all victories which deserve the name. Sir Sidney had gone to Nazareth, and there made this expressive memorandum:-- "I am just returned from the Cave of the Annunciation, where, _secretly_ and _alone_, I have been returning thanks to the Almighty for our late wonderful success. Well may we exclaim, 'the race is not always to the swift, nor the battle to the strong.' W. S. S." It may naturally be presumed that the whole progress of the siege had interested the fleet and army of England in the highest degree. There had been nothing like the defence of Acre in all the history of European war. A siege is pronounced, by military authorities, to be the _most certain_ operation in war; with a fixed number of troops, and a fixed number of guns in the trenches, the strongest place _must fall_ within a prescribed time. But here was a town almost open, and with no other garrison, for the first six weeks of the siege, than a battalion of half-disciplined Mussulmans, headed by such men as could be spared from two British ships of war.