"The 29cm Petard spigot mortar on a Churchill AVRE of 79th Squadron, 5th Assault Regiment, Royal Engineers, under command of 3rd Infantry Division, 29 April 1944. A 40lb bomb can be seen on the right." The 29cm Petard spigot mortar on a Churchill AVRE of 79th Squadron, 5th Assault Regiment, Royal Engineers, under command of 3rd Infantry Division, 29 April 1944. A 40lb bomb can be seen on the right.