Ginkel opened an assault on the eastern part of Athlone on 20 June, which caused the Jacobites to retreat to the west bank of the river, dismantling the bridge in the process. Colonel Grace, who had been superseded as garrison commander by the French officer d'Usson, was killed in a bombardment at the western end of the bridge on the same day. commanded the Jacobite forces in Athlone The Jacobite forces in the western half of Athlone, led by Major-General
Thomas Maxwell, a Scottish Catholic, initially held off the Williamite assault; there was fierce fighting centred on the bridge over the Shannon. The Williamites tried to lay planks over the partially wrecked structure, which the Irish Jacobite troops managed to destroy despite coming under intense fire. One such Jacobite sortie, by a small group of volunteers from Maxwell's
dragoon regiment led by a Sergeant Custume or Costy, all of whom were killed, later passed into Irish folklore as an example of bravery. Several attempts by the Williamites to storm the bridge were repulsed with heavy losses. The Williamite bombardment of the western, Connacht, side of the town was intense, with over 12,000 cannonballs and 600 bombs or mortars fired into the town. John Stevens, serving in the Grand Prior's Regiment, recorded that "with the balls and bombs flying so thick, that spot was hell on earth". During the ten-day bombardment, 32 heavy cannon and mortars fired one shot every minute: Athlone suffered the heaviest bombardment of any city in Britain and Ireland up until that point. While developing a plan to storm the bridge Ginkel identified another potential crossing point at a ford to the south. To test the crossing, on the morning of 29 June he ordered a Danish quartermaster and two privates, under sentence of death for cowardice, to ford the river while troops fired over their heads to give the impression they were deserting. All three forded to the western bank and returned safely, whereupon Ginkel sent a force of
grenadiers, 2,000 strong, to cross there and attack the Jacobite positions from the rear. Following an argument between St Ruth and the garrison commander d'Usson, the fortifications on the western side of the city had not been levelled, as Tyrconnell had suggested some days earlier. St Ruth did not issue an order to demolish them until 29 June, apparently believing it impossible that a city could be taken with a relieving army so close by. ==Aftermath==