On 31 May, "Monarch", under the command of Captain George Borrett, was the sixth ship from the head of the battle line after deployment. During the first stage of the general engagement, the ship fired three salvos of armour-piercing, capped (APC) shells from her main guns at a group of five battleships at 18:32, scoring one hit on the dreadnought that knocked out a gun, temporarily disabled three boilers and started several small fires. At 19:14, she engaged the battlecruiser at a range of with five salvos of APC shells and claimed to her with the last two salvos. "Lützow" was also fired at by "Orion" during this time and was hit five times between the sisters. They knocked out two of her main guns, temporarily knocked out the power to the sternmost turret and caused a fair amount of flooding. This was the last time that "Monarch" fired her guns during the battle, having expended a total of fifty-three 13.5-inch APC shells.