The Royal Navy Gunner in command of the vessel, Ernest Martin Jehan, received the Distinguished Service Cross and members of Inverlyon's crew shared the bounty offered for German submarines.

During this campaign, enemy vessels in the German-defined war zone (German: Kriegsgebiet), which encompassed all waters around the United Kingdom, were to be sunk,[5] and the British fishing fleet was not exempt.

[6][7] One method devised to deal with U-boat attacks was the decoy or Q-ship, designed to lure submarines that were targeting merchant shipping close enough that concealed guns or other weapons could sink them.

[3] On 14 August, the 59-ton smack Bona Fide was stopped by a U-boat, boarded, and sunk with explosives 35 nautical miles (40 mi; 65 km) east-northeast from Lowestoft.

A burst of three rounds from the Inverlyon's weapon scored hits on the conning tower, the second shot destroying part of the bridge and sending Gross into the water.

[9] On 19 November 1915 Jehan was awarded the Distinguished Service Cross (DSC) for the sinking of UB-4,[10] and the crewmen of Inverlyon split the submarine bounty paid by the Admiralty.

[14] On 1 February 1917, the German submarine U-55 shelled and sank Inverlyon 15 nautical miles (28 km) from Trevose Head at position 50°47′N 5°5′W / 50.783°N 5.083°W / 50.783; -5.083; there were no reported casualties.