Kammala jumla mai zuwa: An aika da 1st Battalion, wanda ya fara aiki tare da 25th Infantry Brigade a cikin 50th Division, zuwa Faransa a farkon 1940 don shiga sauran rundunar sojojin Birtaniya. Batun ya yi yaƙi a yakin Dunkirk kuma an tilasta masa ƙaura. Bayan Dunkirk, bataliya ta zama wani ɓangare na 210th Independent Infantry Brigade (Gida), wanda daga baya aka canza shi zuwa 38th (Irish) Brigade. Da farko an haɗa brigade ɗin da Rukunin Sojoji na 6 kuma ya yi aiki tare da su yayin fara Kamfen na Tunisiya har zuwa 2 ga Fabrairun 1943, lokacin da aka musanya shi da Brigade na 1 na Rundunar "Battleaxe" ta 78. Rundunar za ta kasance tare da sashen don sauran yakin, yana aiki a cikin
Yaƙi a Sicily, inda Brigade na Irish ya yi yaƙi, tare da babban nasara, a yakin Centuripe a watan Agusta 1943. Nasarar da aka samu a Sicily ya biyo bayan saukowa a cikin Italiya. A lokacin da yake aiki a Italiya, rundunar ta shiga cikin koguna da yawa da kuma fadace-fadace tare da watakila mafi shahararren shine yakin Monte Cassino, daya daga cikin fadace-fadacen da aka yi a cikin yakin basasa kuma ya ga yakin karshe a Operation Grapeshot.