The three agents boarded a
dinghy and landed on the shore on 7 July 1940 without being challenged. The landing took place in the area of Traspaleen Sound,
Castletownshend. They were carrying suitcases filled with Abwehr-supplied equipment, and were expected to split up immediately and attempt infiltration to Britain. They received no orders to contact the resident German liaison to the IRA – Captain
Hermann Görtz – or the German Legation in Dublin. Later that day, the three men, still travelling together, asked some locals for the fastest way to get to Dublin. On being directed to
Skibbereen, the three men took a bus there and then hitched a lift to
Drimoleague. They were then apprehended by the
Garda Síochána (Irish police) trying to take a bus to
Cork. They were asked to allow their luggage to be inspected and who they were. The agents claimed they were sight-seeing students, but were unable to verify their statements further. They were arrested, and the arresting officers called
Dublin for assistance.
Special Branch officers, dispatched to interview the men, quickly established they were foreign agents. They did this, most likely, by searching their luggage which was found to contain: • Eight incendiary bombs: each eight ounces in weight, made of cylindrical paper tubes filled with
thermite. • Four tins of gun cotton (
nitrocellulose) to a total of 102 ounces. Each tin was labelled 'Carres French Peas'. • Six No. 8
detonators, concealed in wooden containers disguised as fishing reels. • Six lengths of safety fuse, two reels of insulating tape, and two cutting pliers. • Currency totalling £829. Each of the men was sentenced to seven years hard labour. The Abwehr II diary entry for 18 July 1940 recorded: Message received from Dr. Hempel [head of the German Legation in Dublin,
Eduard Hempel] that agents landed in operation Lobster I have been arrested. Equipment provided incriminating evidence. By director's decision further sabotage acts against England are not to be made via Ireland but direct against England. Hempel bitterly complained to his seniors about the botched operation. Firstly, he had been entirely unaware of it. Secondly, he was concerned about how it might affect fragile German-Irish relations. Hempel was right to be concerned; the operation had increased the fears of Irish Military Intelligence
G2 Branch and saw the beginning of co-operation between them and
MI5 throughout the rest of the war. Upon his return to France, Nissen informed the Brest Amt (regional Abwehr office) that he had successfully completed his mission. He then went to north-western
Brittany, where he would wait until called on for his next mission to Ireland,
Operation Lobster II. ==IRA involvement==