Initially, apart from special forces, only Gurkha infantry were used in company strength, and a battalion could only have one operation at a time. As experience and the situation developed these changed, and the Golden Rules on preparation and rehearsal, and the definition of thwarting offensive action relaxed. So too was the need for 'sworn secrecy', if it ever existed, and an early ban on internal discussion of operations. In 1965 penetration limits were increased to in the wake of the Indonesian assault at the Battle of Plaman Mapu, and then . Small amphibious raids on the flanks by Special Boat Service were also authorised.