The British marched on
Rosetta on 8 April, accompanied by 1,000 Ottoman troops, and pushed on to besiege the fort with the
2nd (The Queen's Royal) Regiment of Foot under
Lord Dalhousie. The siege was complicated by the difficulties of bringing artillery to bear on the fort, a task which took eight days. Seven gunboats had to be dragged for across sand and mud before they could be relaunched on the Nile. While 24-pound naval
carronades were landed on the sea shore and dragged overland to reach their firing positions. General
Robert Lawson of the
Royal Artillery took the decision to use naval cannonades rather than heavier standard 24-pounders in the assumption – which proved correct – that the
cement used by the French in their hasty improvement work would not yet have hardened. The French gunboats were driven back by their British opponents, enabling other British and Turkish gunboats to enter the river. On 16 April the artillery preparations were completed and the bombardment commenced, focusing on the south-west angle of the fort. A section of the wall collapsed on 18 April, exposing the French defenders to Turkish
sharpshooters. The French then waved white flags; and after negotiations the French agreed to surrender. ==Aftermath==