To counter elaborately dug-in Japanese troops, a special one-rocket "Projector, Rocket, 3-inch No.10 Mk 1" was designed, under the codename LILO. Two types of rocket were developed using the same No.7 Mk1 motor and either a 21lb HE shell or 60lb HE shell. Both were very-short-range projectiles, rotated in the launcher barrel to limit dispersion, fired by a 3.4 volt battery. The projector and rocket were designed to be portable by one man each. The front legs were fixed but the rear leg was U-shaped and could be moved back and forth to elevate the front of the barrel; aiming was by open sights at close range. The rockets could penetrate of earth and a layer of logs. The apparatus was so inaccurate that five rockets at -range were needed for a 95 per cent chance of a hit.
