ANNEX. I.S.S.B.No.60(I)8. ANTI-INVASION MEASURES:PREPARATION FOR A FEINT INVASION. Memorandum by the Inter-Services Security Board. The Chiefs of Staff at their meeting* on the 21st September, 1940, had under consideration a suggestion that it might be desirable to collect a number of barges and other vessels in a port of Scotland which would give the appearance of preparation for an invasion of Norway. Dummy boats might be used. If the port selected was out of range of enemy fighters it might afford us an opportunity of inflicting casualties on enemy bombers.